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D016206:Databases, Bibliographic; D006801:Humans; D016239:MEDLINE; D009317:National Library of Medicine (U.S.); D010506:Periodicals as Topic / Q000706:statistics & numerical data*; D011643:Publishing / Q000706:statistics & numerical data; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data*; D014481:United States