Tugwell Peter, Petticrew Mark, Kristjansson Elizabeth, Welch Vivian, Ueffing Erin, Waters Elizabeth, Bonnefoy Josiane, Morgan Antony, Doohan Emma, Kelly Michael P
Department of Medicine and Institute of Population Health, University of Ottawa, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
BMJ. 2010 Sep 13;341:c4739. doi: 10.1136/bmj.c4739.