title: A bibliometric analysis of the 100 most influential papers on COPD.
abstract: OBJECTIVE
  We aimed to identify the 100 top-cited articles published on chronic obstructive pulmonary disease (COPD) and to analyze their characteristics so as to provide information on the achievement and development in COPD research over the past decades.
  
  
  METHODS
  A comprehensive list of citation classics in COPD was generated by searching the Science Citation Index expanded database, using the keywords "COPD" or "chronic obstructive pulmonary disease" or "chronic obstructive pulmonary diseases". The 100 top-cited research papers were retrieved by reading the abstract or full text if needed. All eligible articles were read for basic information, including country of origin, organizations, article type, journals, research field, and authors.
  
  
  RESULTS
  The 100 top-cited articles on COPD were published between 1966 and 2010. The number of citations ranged from 254 to 2,164, with a mean of 450 citations for each article. These citation classics were from 32 countries, with 38 from the United States. The Imperial College London led the list of classics, with 16 papers. The 100 top-cited articles were distributed in 18 journals, with the American Journal of Respiratory, Critical Care Medicine, and Journal of the American Medical Association topping the list. Among the various fields, both respiratory system (63%) and general internal medicine (63%) were the most common fields of study for the 100 articles.
  
  
  CONCLUSIONS
  Our bibliometric analysis provides a historical perspective on the progress of scientific research on COPD. Articles originating from the United States and published in high-impact specialized respiratory journals are most likely to be cited in the field of COPD research.
authors.affiliation: Department of Respiratory Medicine, People's Hospital of Shanghai, Pudong New Area, People's Republic of China.
authors.forename: Wenchao
authors.initials: W
authors.lastname: Gu
authors.affiliation: Department of Respiratory Medicine, People's Hospital of Shanghai, Pudong New Area, People's Republic of China.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Department of Respiratory Medicine, People's Hospital of Shanghai, Pudong New Area, People's Republic of China.
authors.forename: Hua
authors.initials: H
authors.lastname: Yang
authors.affiliation: Department of Respiratory Medicine, People's Hospital of Shanghai, Pudong New Area, People's Republic of China.
authors.forename: Guangsheng
authors.initials: G
authors.lastname: Qi
authors.affiliation: Department of Respiratory Medicine, Tongren Hospital, Shanghai, People's Republic of China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Jin
authors.affiliation: Department of Respiratory Medicine, Tongren Hospital, Shanghai, People's Republic of China.
authors.forename: Jin
authors.initials: J
authors.lastname: Yan
mesh_terms: D000818:Animals; D001319:Authorship; D015706:Bibliometrics; D035843:Biomedical Research / Q000706:statistics & numerical data*; D006801:Humans; D010506:Periodicals as Topic / Q000706:statistics & numerical data*; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy; D015272:Pulmonary Medicine / Q000706:statistics & numerical data*; D013038:Specialization / Q000706:statistics & numerical data; D013997:Time Factors
keywords: chronic obstructive pulmonary disease; citation analysis; top-cited
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