title: Impact factor as the best operational measure of medical journals.
mesh_terms: D001290:Attitude; D015706:Bibliometrics; D006801:Humans; D009316:National Institutes of Health (U.S.); D010506:Periodicals as Topic / Q000706:statistics & numerical data; D011643:Publishing / Q000706:statistics & numerical data; D012586:Science; D014481:United States