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Trialscentral.org, USA
CSE Headquarters, Wheat Ridge, USA
M. Hewitt, The NIHR RDS EM/YH, Sheffield, UK, 2009
Textbook, Research Council, The National Academy Press, Washington, USA, 2004
Journal, BioMed Central, London, UK
Book, C. Pope, N. Mays, John Wiley & Sons, Inc., Hoboken, USA
International Association of Medical Science Educators (IAMSE), Huntington, USA
Journal, National Library of Medicine, Bethesda, USA, 2003-2008
Journal, Biomed Central, London, UK
Clarivate Analytics, Philadelphia, USA
Health Information Research Unit, McMaster University, Hamilton, Canada
A. R. Jadad, BMJ Journals
Journal, The Biologists Company, Cambridge, UK
Journal, PubMed Central, National Library of Medicine, Bethesda, USA
Journal, PubMed Central, National Library of Medicine, Bethesda, MD, USA
International Standard Randomised Controlled Trial Number (ISRCTN), BioMed Central, London, UK
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