Falck-Ytter Yngve, Schünemann Holger, Guyatt Gordon
Division of Gastroenterology, Case and VA Medical Center, Case Western Reserve University, Cleveland, OH 44106, USA.
J Clin Epidemiol. 2010 May;63(5):474-5. doi: 10.1016/j.jclinepi.2010.01.003. Epub 2010 Feb 26.