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1. Randomized, controlled trials, observational studies, and the hierarchy of research designs.

Authors: J Concato; N Shah; R I Horwitz
Journal: N Engl J Med Date: 2000-06-22 Impact factor: 91.245

Authors: G Yamey
Journal: West J Med Date: 2000-07

Authors: A Carr
Journal: BMJ Date: 2001-06-16

Authors: J Martens-Lobenhoffer; F P Meyer
Journal: Eur J Clin Pharmacol Date: 2001-04 Impact factor: 2.953

Authors: Su Mason; Philip Tovey; Andrew F Long
Journal: BMJ Date: 2002-10-12

Authors: N J Gogtay; H A Bhatt; S S Dalvi; N A Kshirsagar
Journal: Drug Saf Date: 2002 Impact factor: 5.606

Authors: Shelley R Adler
Journal: Med Anthropol Q Date: 2002-12

Authors: James Olusegun Bamidele; Wasiu Olalekan Adebimpe; Edward Adekola Oladele
Journal: Afr J Tradit Complement Altern Med Date: 2009-05-07

Authors: Nina C Di Pietro; Louise Whiteley; Ania Mizgalewicz; Judy Illes
Journal: J Autism Dev Disord Date: 2013-01

Authors: Manfred Hensel; Martin Zoz; Anthony D Ho
Journal: Support Care Cancer Date: 2008-05-06 Impact factor: 3.603