Instructions for authors

3.1 BEFORE YOU BEGIN

• Ethical responsibilities

  Authors submitting a manuscript accept full responsibility for its content as defined by the International Committee of Medical Journal Editors (see ICMJE).

  The research reported in papers submitted to Rev Esp Cardiol should be carried out in accordance with internationally accepted recommendations for clinical investigation (Declaration of Helsinki from the World Medical Association) or for laboratory research involving animals (American Physiological Society).

  Relevant ethical documentation should be made available if required by the editorial team.

  Rev Esp Cardiol is a member of the Committee on Publication Ethics (COPE) and adheres to their recommendations and principles.

• Submission declaration

  Submission of an article implies that the work described has not been previously published (except in the form of an abstract or as part of a published lecture or academic thesis or as an electronic preprint, see the "Multiple, redundant or concurrent publication" section of our ethics policy for more information), that it is not under consideration for publication elsewhere, that its publication has been approved by all authors and tacitly or explicitly by the responsible authorities where the work was carried out, and that, if accepted, it will not be published elsewhere in the same form, in English or in any other language, including electronically, without the written consent of the copyright-holder. To verify originality, the manuscript may be checked by the originality detection service CrossCheck.

  Preprint

  REC: Publications does not consider preprints as prior publication. Preprints can be sent for evaluation if on submission the authors disclose in the cover letter that the article is a preprint and confirm that it has not been peer-reviewed nor published in an indexed publication. In the same letter they should provide a link to the preprint publication. If the article is finally published, it is the authors’ responsibility to include a link in the preprint version that redirects to the published version.

• Declaration of generative AI in scientific writing

  The below guidance only refers to the writing process, and not to the use of AI tools to analyse and draw insights from data as part of the research process.

  Where authors use generative artificial intelligence (AI) and AI-assisted technologies in the writing process, authors should only use these technologies to improve readability and language. Applying the technology should be done with human oversight and control, and authors should carefully review and edit the result, as AI can generate authoritative-sounding output that can be incorrect, incomplete or biased. AI and AI-assisted technologies should not be listed as an author or co-author, or be cited as an author. Authorship implies responsibilities and tasks that can only be attributed to and performed by humans, as outlined in AI policy for authors.

  Authors should disclose in their manuscript the use of AI and AI-assisted technologies in the writing process by following the instructions below. A statement will appear in the published work. Please note that authors are ultimately responsible and accountable for the contents of the work.

  Disclosure instructions

  Authors must disclose the use of generative AI and AI-assisted technologies in the writing process by adding a statement at the end of their manuscript in the core manuscript file, before the References list. The statement should be placed in a new section entitled ‘Statement on the use of artificial intelligence’.

  Statement: During the preparation of this work the author(s) used [NAME TOOL / SERVICE] in order to [REASON]. After using this tool/service, the author(s) reviewed and edited the content as needed and take(s) full responsibility for the content of the publication.

  This declaration does not apply to the use of basic tools for checking grammar, spelling, references etc.

  f the authors have used AI to analyse and extract knowledge from the data as part of the research process, this should be stated in the corresponding section. In addition, the type of tool and the way in which it has been used to make the results reproducible should be indicated in the "Methods" section.

• Sex and gender reporting

  Reporting guidance

  For research involving or pertaining to humans, animals or eukaryotic cells, investigators should integrate sex and gender-based analyses (SGBA) into their research design according to funder/sponsor requirements and best practices within a field. Authors should address the sex and/or gender dimensions of their research in their article. In cases where they cannot, they should discuss this as a limitation to their research's generalizability. Importantly, authors should explicitly state what definitions of sex and/or gender they are applying to enhance the precision, rigor and reproducibility of their research and to avoid ambiguity or conflation of terms and the constructs to which they refer (see Definitions section below). Authors can refer to the Sex and Gender Equity in Research guidelines (SAGER, https://researchintegrityjournal.biomedcentral.com/articles/10.1186/s41073-016-0007-6) and the SAGER guidelines checklist. These offer systematic approaches to the use and editorial review of sex and gender information in study design, data analysis, outcome reporting and research interpretation - however, please note there is no single, universally agreed-upon set of guidelines for defining sex and gender.

  Definitions

  Sex generally refers to a set of biological attributes that are associated with physical and physiological features (e.g., chromosomal genotype, hormonal levels, internal and external anatomy). A binary sex categorization (male/female) is usually designated at birth ("sex assigned at birth"), most often based solely on the visible external anatomy of a newborn. Gender generally refers to socially constructed roles, behaviors, and identities of women, men and gender-diverse people that occur in a historical and cultural context and may vary across societies and over time. Gender influences how people view themselves and each other, how they behave and interact and how power is distributed in society. Sex and gender are often incorrectly portrayed as binary (female/male or woman/man) and unchanging whereas these constructs actually exist along a spectrum and include additional sex categorizations and gender identities such as people who are intersex/have differences of sex development (DSD) or identify as non-binary. Moreover, the terms "sex" and "gender" can be ambiguous—thus it is important for authors to define the manner in which they are used. In addition to this definition guidance and the SAGER guidelines, the resources on this page offer further insight around sex and gender in research studies.

• Informed consent

  If the work involves the use of human subjects or animals, indicate whether the procedures performed were carried out in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans and the Uniform Requirements for Manuscripts Submitted to Biomedical Journals.

  Authors must have obtained and filed the informed consent of all the individuals studied and declare in the manuscript that consents are available. The privacy rights of human subjects must always be observed and all information/images must be anonymized to guarantee the protection of personal data.

  All animal experiments should comply with the ARRIVE guidelines and should be carried out in accordance with the UK Animals (Scientific Procedures) Act, 1986 and associated guidelines, EU Directive 2010/63/EU for animal experiments, or the National Institutes of Health guide for the care and use of laboratory animals (NIH Publications, revised 2011) and the authors should clearly indicate in the manuscript that such guidelines have been followed.

  Systematic reviews and meta-analyses should follow the PRISMA statement criteria (https://doi.org/10.1136/bmj.n71).

• Clinical trial results

  In line with the position of the International Committee of Medical Journal Editors, the journal will not consider as prior publication results that are posted in the same clinical trials registry as the primary registration if the results posted are presented in the form of a brief structured (less than 500 words) abstract or table. However, dissemination of results in other circumstances (eg, investors' meetings) is discouraged and may jeopardize consideration of the manuscript. Authors should fully disclose all inclusion in registries of results of the same or closely related work.

  Description of randomized clinical trials

  Randomized controlled trials should be presented according to the CONSORT guidelines. At manuscript submission, authors must provide the CONSORT checklist accompanied by a flow diagram illustrating patients' progress through the trial, including recruitment, enrollment, randomization, withdrawal, and completion, and a detailed description of the randomization procedure. The CONSORT checklist and template flow diagram are available online.

  Registration of clinical trials

  Registration in a public trials registry is a condition for publication of clinical trials in Rev Esp Cardiol, in accordance with International Committee of Medical Journal Editors recommendations. Trials must be registered at or before the start of patient enrollment. The clinical trial registration number should be included at the end of the abstract of the article. A clinical trial is defined as any research study that prospectively assigns human participants or groups of humans to one or more health-related interventions to evaluate the effects of health outcomes. Healthrelated interventions include any intervention used to modify a biomedical or health-related outcome (eg, drugs, surgical procedures, devices, behavioral treatments, dietary interventions, and process-of-care changes). Health outcomes include any biomedical or health-related measures obtained in patients or participants, including pharmacokinetic measures and adverse events. Purely observational studies (those in which the assignment of the medical intervention is not at the discretion of the investigator) will not require registration.

• Declaration of interest

  All authors must complete the International Committee of Medical Journal Editors conflict of interest form, available at (http://www.icmje.org/disclosure-of-interest/). During the manuscript submission process, the corresponding author will be responsible for declaring all conflicts of interests related to the article in a specific section for this purpose. If the manuscript is accepted, this information will be included in the final article in a new section entitled Conflicts of interests.

• Funding source(s)

  Authors are requested to identify institutions that have provided financial support for the conduct of the research and/or preparation of the article and to briefly describe the role of the sponsor(s), if any, in study design; in data collection, analysis, and interpretation; in drafting the manuscript; and in the decision to submit the article for publication. If the funding source(s) had no such involvement, then this should be stated.

  Funding body agreements and policies

  Elsevier has established a number of agreements with funding bodies that allow authors to comply with their funder's open access policies. More information is available on existing agreements.

• Authorship

  Rev Esp Cardiol ascribes to the authorship criteria for scientific articles defined by the International Committee of Medical Journal Editors. Thus, authors must have:

  • Substantially contributed to the conception or design of the work or the acquisition, analysis, or interpretation of the data for the work
  • Drafted the work or revised it critically for important intellectual content
  • Given final approval of the version to be published
  • Agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved

  For articles accepted for publication, authors are advised that all documentation related to the article (protocols, statistical analyses, contracts...) be published or available. Please bear in mind that the editorial board of Rev Esp Cardiol can request this documentation whenever it deems it appropriate. The corresponding author, on behalf of the authors signing the article, should confirm that they have had access to all data pertaining to the study and that they assume full responsibility for the data integrity and for the accuracy of the data analysis.

  During the manuscript upload process, the corresponding author will be required to provide a paragraph specifying the individual authorship contribution of each author. Should the article be accepted, this information will be included in the final manuscript.

  Authors are expected to consider carefully the list and order of authors before submitting their manuscript and to provide a definitive list of authors at the time of the original submission. Any addition, deletion, or rearrangement of authors' names in the authorship list should be made through the following form, giving a) the reason for the change in author list, and b) written confirmation (e-mail, letter) from all authors that they agree with the addition, removal, or rearrangement. Addition or removal of authors must include confirmation from the author being added or removed. The completed form must be sent through the manuscript management system together with the new version of the article using the Cover letter menu item. The editor assigned to the manuscript will individually review each case.

  Only in exceptional circumstances will the editor consider the addition, deletion, or rearrangement of authors after manuscript acceptance. While the editor considers the request, publication of the manuscript will be suspended.

• Copyright and authors' rights

  Upon article acceptance, authors will be asked to complete a 'Journal Publishing Agreement' (more information). An e-mail will be sent to the corresponding author with a link to the online version of this agreement.

  Authors may reproduce abstracts or prepare lists of articles including abstracts for internal circulation within their institutions. The permission of the publisher is required for resale or distribution outside the institution and for all other derivative works, including compilations and translations. If excerpts from other copyrighted works are included (including figures and tables), the author(s) must obtain written permission from the copyright owners and credit the source(s) in the article and include it in the bibliography. Elsevier has preprinted formsfor use by authors in these cases.

  Authors (or their employers or institutions) have certain rights to reuse their work. Find out more.

  Responsible sharing. Authors can also share the research they publish in Elsevier journals. Find out more.

  Green open access. Authors can share their research in a variety of different ways and Elsevier has a number of green open access options. We recommend authors see our green open access page for further information. Authors can also self-archive their manuscripts immediately and enable public access from their institution's repository after a 12-month embargo period from the publication of an article in an issue. This is the version that has been accepted for publication and that typically includes author-incorporated changes suggested during submission by peer reviewers and the journal's editors. Embargo period: For subscription articles, an appropriate amount of time is needed for journals to deliver value to subscribing customers before an article becomes freely available to the public. This is the embargo period, which lasts for 12 months after online publication of the article in its final citable form Find out more.

• Form of publication

  Rev Esp Cardiol offers authors a choice on publication mode (Open access or Restricted access). Regardless of the mode chosen, the journal will apply the same peer-review criteria and acceptance standards. There is no charge for article submission or publication and authors can choose to have color figures in the print version of the article once it has been accepted; this costs 600 EUR per article. The electronic version is published in full color in both languages without additional cost.

  Articles published in Rev Esp Cardiol have a 12-month embargo period after the date of online publication of the final citable version, after which they become open access. Nonetheless, authors can choose to pay to make their article open access from submission.

  Open access

  • An open access publication fee is payable by authors or on their behalf, for example, by their research funder or institution.
  • Articles will be freely available, without an embargo period, to both subscribers and the wider public and their reuse is permitted.
  • In this form, articles are licensed under a Creative Commons license, which defines the permitted uses of the work.

    Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)
    
    For noncommercial purposes, allows others to distribute and copy the article, and to include it in a collective work (such as an anthology), as long as they credit the author(s) and provided they do not alter or modify the article.

  • The open access fee for this journal is 2880 EUR (excluding taxes). Learn more about Elsevier's pricing policy.

  Embargo

  • There is no fee for the publication of your article
  • Articles published in this publication mode are subject to an embargo period (12 months from the date of online publication of the article in its final citable version) of restricted access before being made available to the general public. During the embargo period, articles will be available to journal subscribers as well as developing countries and patient groups through our universal access programs (http://www.elsevier.com/access)
    
    

  Misconduct in scientific publication

  • Redundant publication
    This happens when an article coincides substantially with another previously published by the same authors. This usually happens when articles are simultaneously sent for evaluation to several journals.
  • Plagiarism
    Plagiarism is substantially copying the content of someone else’s or one’s own work and presenting it as previously unpublished.
  • Fabrication or data omission
    It is considered misconduct to fabricate or omit relevant data in an investigation with the intention of altering the conclusions of the work. This includes the manipulation or edition of images.
  • Salami slicing
    It is the division of a research report into multiple components or pieces and publishing these individual components as separate research articles.
  • Ghost, guest, or gift authorship
    This consists of including in the authorship people who have not participated in the project or who do not meet the requirements of the International Committee of Medical Journal Editors to be considered as an author. This practice usually responds to personal interests or professional ties.
  • Omission of conflicts of interest or funding
    The intentional omission of conflicts of interest or funding in order not to compromise the publication of an article.
  • Publication of studies without informed consent
    Patient research always requires the explicit consent of patients or their guardians for the publication of their case, even if the data is completely anonymized. Using patients’ medical information without their consent is considered misconduct in the investigation.

  The journal will investigate any ethical infraction taking all reasonable measures for its prompt resolution, acting with proportionality and if necessary, involving the institutions of origin of those concerned.

• Data protection

  To facilitate article publication, personal data will be entered into an automatic database belonging to the Spanish Society of Cardiology. Unless otherwise indicated, by submitting your article, you expressly authorize that your first name, second name(s), contact address, and e-mail address will be published in Rev Esp Cardiol, the annual summary published by the Spanish Society of Cardiology, and on the webpage (www.revespcardiol.org) in order to acknowledge authorship of the article and to assist readers in contacting you.

3.2. INSTRUCTIONS FOR AUTHORS

• Submission

  Manuscripts should be submitted for evaluation by Rev Esp Cardiol via an online manuscript management system https://www.editorialmanager.com/REC/. Any queries should be addressed to our editorial office: recpublications@secardiologia.es or +34 91 724 23 70.

  Our online submission system guides authors step-by-step through the process of entering details related to their articles and uploading their files. The system converts article files to a single PDF used in the blind peer-review process. All correspondence related to manuscript review is sent by e-mail.

• Language and electronic publication

  This journal is published in Spanish and in English and accepts articles submitted in either of the 2 languages, but not both. Articles submitted in both languages will be automatically rejected.

  Because Rev Esp Cardiol is a bilingual journal, its editorial processes are complex. To expedite publication time, articles are first published in their original submission language. The process of article production in the complementary language will begin once the first version of the article has been published online (ahead of print).

  While the translation of the submitted article is under preparation, it will be available in its original language at ScienceDirect and in the ahead of print section of our website, depending on the language (http://www.revespcardiol.org/en-ahead-of-print). Accepted English articles will also benefit from becoming automatically available in PubMed. Accepted Spanish articles will have to wait for the English version before inclusion in this database.

• General points

  • Articles must be submitted in the following format: double-spaced, with 2.5-cm margins, and numbered pages
  • The maximum length of the article encompasses the manuscript word count, including the references, abstract, key points, and figure captions, and excludes only the tables
  • A cover letter should be included with relevant information about the manuscript (eg, originality, authorship, relevance of the topic)
  • The evaluated article comprises at least 2 documents: title page and manuscript
  • To guarantee double-blind review, any information that could identify the authors must be omitted from all files, except the title page and cover letter
  • The use of inclusive language is recommended. For articles written in Spanish, Rev Esp Cardiol recommends reviewing the following guide: https://www.icmm.csic.es/img/Guia-para-un-uso-no-sexista-de-la-lengua-en-la-UAM.pdf
  • The title page must include the title in English and Spanish, first name(s) and second name(s) of the author(s), authors' affiliations (department, institution, city, and country), e-mail addres of the corresponding author, personal or institutional Twitter account if the authors so wish, conflicts of interests, and funding source(s), as follows:
    1. Title. Concise and informative. Titles are often used in information-retrieval systems. Avoid abbreviations and formulae where possible. The title in Spanish should also be included
    2. Author names and affiliations. Please clearly indicate the given name(s) and family name(s) of each author and check that all names are accurately spelled. Present the authors' affiliations (where the actual work was done) below the names. Indicate all affiliations with a lower-case superscript letter immediately after each author's name and in front of the appropriate address. The same letter must precede the institutional information (department, institution, city, and country)
    3. Corresponding author.Clearly indicate the corresponding author, and ensure that the e-mail address given is correct and kept up-to-date during the editorial process. It is understood that the corresponding author takes responsibility for following these guidelines and that all coauthors are aware of them, have participated in preparing the manuscript, and fully agree on its content. We recommend maintaining the same corresponding author throughout all editorial stages and publication, as well as in postpublication. If the corresponding author of a published article differs from the one who submitted the article via Editorial Manager, both authors will assume all responsibilities related to the corresponding authorship.
    4. Funding sources. List funding sources in the following standard format required by funding bodies:

       Funding: This work was supported by the National Institutes of Health [grant numbers xxxx, yyyy]; the Bill & Melinda Gates Foundation, Seattle, WA [grant number zzzz]; and the United States Institutes of Peace [grant number aaaa].

       It is not necessary to include detailed descriptions on the program or type of grants and awards. When funding is from a block grant or other resources available to a university, college, or other research institution, submit the name of the institute or organization that provided the funding.

       In case of individual funding to one of the authors, this should be reflected separately. For example: This work has been funded by the National Institutes of Health [grant number xxxx, yyyy]. Dr. Garcia has received funding from (name of institution).

    5. Acknowledgments. To ensure anonymity during the manuscript evaluation process, place the acknowledgments section on the "first page" file. Do not acknowledge support elsewhere in the manuscript. List here those individuals who provided help during the research (eg, language help, writing assistance, or proofreading). Written permission must be sent to Rev Esp Cardiol (form) from those individuals mentioned in this section using the Cover letter menu item. After article acceptance, this information will be placed after the Conflicts of interests section.
  • In the case of images, figures should preferably be sent in TIFF or JPG format, with a resolution higher than 300 dpi and using black for lines and text. For graphics and diagrams, please send editable formats (Word, Excel, etc.). Figures are designated by Arabic numerals in the order of their first appearance in the text. Figures, symbols, letters, etc must be large enough to be clearly identified when the figure is reduced. Details must be highlighted with arrows. High-contrast marking and letters should be used for all symbols or letters added to the figure. Define abbreviations in alphabetical order and the meaning of any symbols used in the figure caption. Figures must not include any information that would allow a patient or hospital to be identified. Patient photographs must be taken in a way that ensures anonymity, or the consent of that patient must also be sent.
  • Continuous data, particularly in the case of small sample sizes, should be presented with figures showing the complete data distribution and, where possible, as scatter point diagrams, showing individual data points along with average/error bars (instead of boxes). If there are specific reasons not to use this type of presentation, the author should indicate it and justify it appropriately. Check that your manuscript complies with thees indications before uploading it.
  • Tables should be numbered in Arabic numerals in the order of their appearance in the text. Provide each table on a separate page. Place the title at the top of the page and abbreviations in alphabetical order at the bottom. Content must be self-explanatory and do not repeat information in the text or in figures.
  • If the figures or tables mention a published work, the article should be cited consecutively with the other references, that is, according to their order of appearance in the text, tables, and figures. If the material has been obtained from another publication, it is the authors' responsibility to obtain the required permission for its translation, reproduction, or adaptation (Spanish and English and electronic and physical format). Rev Esp Cardiol will not be held responsible for any costs associated with this process.
  • Any references contained in the material must adhere to the guidelines indicated in the References section of these instructions.
  • Any supplementary data must adhere to the guidelines indicated in the supplementary data section of these instructions.
  • Use of word processing software. It is important that the file be saved in the native format of the word processor used. The text should be in single-column format. Keep the layout of the text as simple as possible. Most formatting codes will be removed and replaced during article processing. In particular, do not use the word processor's options to justify text or to hyphenate words. Any subsections should be clearly identified by using a hierarchy. When preparing tables with a word processor, if you are using a table grid, use only one grid for each individual table and not a grid for each row. If no grid is used, use tabs, not spaces, to align columns. The electronic text should be prepared in a way very similar to that of conventional manuscripts. Note that source files of figures, tables, and text graphics will be required. To avoid unnecessary errors, authors are strongly advised to use the 'spell-check' and 'grammar-check' functions of their word processor.
  • Central illustration. Original articles must include a central illustration. It should be referenced in the text and numbered in sequence with the rest of the figures in the manuscript. The corresponding figure legend should specify that it is the central illustration of the article and provide a description of the figure. The central illustration should follow the abovementioned guidelines for figures included in these instructions. You can consult examples of best practices in the Elsevier website (http://www.elsevier.com/graphicalabstracts).

• Central illustration

  Original articles must include a central illustration. It should be referenced in the text and numbered in sequence with the rest of the figures in the manuscript. The corresponding figure legend should specify that it is the central illustration of the article and provide a description of the figure. The central illustration should follow the abovementioned guidelines for figures included in these instructions. You can consult examples of best practices in the Elsevier website (http://www.elsevier.com/graphicalabstracts).

• References

  • References must follow the format used by the American Medical Association.
  • List references numerically, in superscript format, in the order they first appear in the text.
  • Do not include mention of personal communications or unpublished data. Such references, however, may be included within parentheses in the text
  • When abstracts are cited, they should be identified as [abstract] within square brackets after the title, and they should be less than 2 years old.
  • In references to medical journals, use the standard abbreviation of the journal title.
  • References should be sent as standard text, never as footnotes. The field codes of reference management programs are not acceptable; if the authors have worked with reference management software, the file must be converted to plain text before it is submitted.

  Journal article. List all authors. If there are more than 6 authors, list only the first 3, followed by the Latin abbreviation 'et al'. Example: Luttik MLA, Jaarsma T, Van Geel PP, et al. Long-term follow-up in optimally treated and stable heart failure patients: primary care vs heart failure clinic. Results of the COACH-2 study. Eur J Heart Fail. 2014;16:1241-1248.

  Ahead of print article Authors, title, journal, year, web page, date of access. Example: Senoo K, Proietti M, Lane DA, Lip GY. Evaluation of the HAS-BLED, ATRIA and ORBIT bleeding risk scores in atrial fibrillation patients on warfarin. Am J Med. 2015. http://dx.doi.org/10.1016/j.amjmed.2015.10.001.

  Preprints. Authors, title, year, link, and date of last access. Example: Ingino C. Innovación e inteligencia artificial en medicina. OSF Preprints [preprint]. 2019. Available at: https://doi.org/10.31219/osf.io/37fn2. Accessed 5 Jul 2021.

  Electronic book. Authors, title [Internet], city, publisher, year, web page. Example: Sobieraj DM, White CM, Kluger J, et al. Adjunctive Devices for Patients With Acute Coronary Syndrome Undergoing Percutaneous Coronary Intervention [Internet]. Rockville (MD): Agency for Healthcare Research and Quality (US); 2011. Available at: https://www.ncbi.nlm.nih.gov/books/NBK83532/.

  Book chapter. Authors, chapter title, editors, book title, city, publisher, year, and page numbers. Example: Josephson ME. Intraventricular conduction disturbances. In: Josephson ME, ed. Clinical cardiacelectrophysiology. Techniques and interpretations. 3a ed. Philadelphia: Lippincot Williams & Wilkins; 2002. p. 110-139.

  Book. Cite the specific pages. Example: Rothman K, Greenland S. Modern epidemiology. Measures of effect and measures of association. Philadelphia: Lippincott-Raven; 1998. p. 51-70.

  Web page. Example: National Institute for Health and Clinical Excellence. Chronic heart failure in adults: management. 2010. Available at: http://www.nice.org.uk/Guidance/cg108. Accessed 6 Dec 2011.

  Unpublished conference abstract. VVeronesi F, Korfiati A, Buffat R, Raubal M. Assessing accuracy and geographical transferability of machine learning algorithms for environmental modelling (8). In: Agile 2017. 20th Conference on Geo-Information Science; 2017 May 9-12; Wageningen, The Netherlands. Available at: https://agile-online.org/conference/proceedings/proceedings-2017. Accessed 17 Abr 2023.

  Supplement. Example: Malecka-Tendera E, Mazur A. Childhood obesity: a pandemic of the twenty-first century. Int J Obes (Lond). 2006;30(Suppl 2):S1-3.

  Database. Example: Base de Datos Clínicos de Atención Primaria (BDCAP). Morbilidad registrada en Atención Primaria. Madrid: Ministerio de Sanidad, Servicios Sociales e Igualdad; 2020. http://www.msssi.gob.es/
  estadEstudios/estadisticas/estadisticas/estMinisterio/SIAP/home.htm. Accessed 1 Jun 2022.

• Supplementary data

  Rev Esp Cardiol accepts supplementary electronic data to support and improve the presentation of authors' scientific research. The publication of online-only supplementary data will remain at the discretion of the Editorial Team. Only material directly relevant to the article content will be considered for e-publication. This material will not be translated, typeset, or proofread. The Editorial Board reserves the right to refuse electronic material not deemed appropriate.

  To ensure that submitted material is in the correct format, we recommend the following: text (Word document, maximum 300 kb); images (JPG format, maximum 10 MB); audio (MP3 format, maximum 10 MB); videos (MPG format, maximum 50 MB). Authors should submit supplementary data in electronic form through the online manuscript management system as a multimedia file along with the article. Each file should have a concise and descriptive title. This material must also meet all requirements and general ethical responsibilities described in these guidelines.

3.3. TYPES OF ARTICLES

• Original articles

  • These articles should not exceed 5000 words including the abstract, the text, the references list, the figure legends, and excluding the tables alone, and should contain and a title in Spanish and English (less than 150 characters and spaces)
  • A central illustration must be included in this section. Please refer to "Central illustration" section for instructions.
  • The manuscript should be arranged in the following order:
    1. Structured abstract in English (maximum 250 words) and key words (from 3 to 10). The abstract should be structured in 4 sections: a) Introduction and objectives; b) Methods; c) Results; and d) Conclusions. The abstract should be self-explanatory and should not contain references. Up to 3 abbreviations will be accepted, as long as each is used at least 3 times. Define all abbreviations on first mention in the text, except commonly used units of measure (apart from effect units). Acronyms for the names of studies, trials, registries, and scales can be used without definition on first mention, as long as they are widely used in the literature
    2. MeSH terms. To ensure the proper indexing of the article and its subsequent retrieval in database searches, authors should ensure that at least 3 of the keywords are MeSH terms. Please check in https://www.ncbi.nlm.nih.gov/mesh/.
    3. Structured abstract in Spanish and key words, with an identical structure to English
    4. Table of abbreviations in Spanish and English (no more than 6 of the most frequently used in the text)
    5. Text. The body of the article should consist of the following sections: a) Introduction; b) Methods; c) Results; d) Discussion; and e) Conclusions. Sections should be appropriately subdivided and subtitled
    6. Key points. Include the following information at the end of the article:
       - What is known about the topic? Include 3 or 4 sentences that summarize key points on what is known about the research topic (do not exceed 100 words).
       - What does this study add? Include 3 or 4 sentences summarizing key points on the contribution of the study (do not exceed 100 words)
    7. References
    8. Tables (optional)
    9. Figure captions and figures (optional)

  In addition, articles on study protocols will be considered for publication if they comply with the following:

  • Randomized clinical trial
  • Approval of the institutional review board or local ethics committee
  • Identification of funding source and proof of funding approval
  • Registration of the study with a clinical trial registry
    (ej. www.clinicaltrials.gov)

• Scientific letters

  In this typology, articles that include research with patients or basic science or clinical case series of special clinical relevance will be considered. The acceptance of unique clinical cases will be exceptional and restricted to cases that have significant formative or therapeutic implications.

  • No more than 6 authors
  • No more than 1000 words (excluding tables) and a title in Spanish and English (less than 150 characters and spaces)
  • Without abstract, key words, or a hierarchy of headings and subheadings
  • No more than 6 references
  • No more than 2 elements (figures or tables)

• Letters to the Editor

  This section includes correspondence related to articles published in Rev Esp Cardiol or concerning editorial matters. Letters in response to articles published in the journal should be submitted within 12 weeks of the publication of the article and cannot include original data.

  • No more than 4 authors
  • No more than 800 words and a title in Spanish and English (less than 150 characters and spaces)
  • No more than 2 figures and no tables

• Images in cardiology

  • No more than 3 authors
  • The title (in Spanish and English) must contain less than 8 words
  • The accompanying text should not exceed 250 words and should contain information of clear relevance, with no bibliographic references or figure captions. All symbols evident in the images should be adequately explained in the accompanying text
  • No more than 3 figures