1 Department of Clinical Epidemiology and Biostatistics, McMaster University, 1200 Main St. West, Hamilton, Canada L8S 4K1; Department of Medicine, McMaster University, 1200 Main St. West, Hamilton, Canada L8S 4K1. Electronic address: guyatt@mcmaster.ca.
2 Department of Clinical Epidemiology and Biostatistics, McMaster University, 1200 Main St. West, Hamilton, Canada L8S 4K1; Department of Medicine, McMaster University, 1200 Main St. West, Hamilton, Canada L8S 4K1.
3 Department of Internal Medicine, Division of Evidence-based Medicine and Health Outcomes Research, University of South Florida, 4202 East Fowler Avenue, Tampa, FL 33612, USA.
4 Department of Clinical Epidemiology and Biostatistics, McMaster University, 1200 Main St. West, Hamilton, Canada L8S 4K1; Department of Internal Medicine, American University of Beirut, Cario Street, Riad-El-Solh Beirut, Beirut 1107 2020, Lebanon.