Oxman Andrew D, Lombard Carl, Treweek Shaun, Gagnier Joel J, Maclure Malcolm, Zwarenstein Merrick
Preventive and International Health Care Unit, Norwegian Knowledge Centre for the Health Services, Oslo, Norway.
J Clin Epidemiol. 2009 May;62(5):485-8. doi: 10.1016/j.jclinepi.2008.08.015.