The impact factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years.
a
Fu Wai Hospital, State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Diseases, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
b
Department of Cardiology, Peking Union Medical College Hospital, Peking, Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
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