1. From the Department of Public Health Sciences, School of Public Health (D.T.E., D.L.W., R.T.T., J.A.J.), Department of Medicine, Faculty of Medicine and Dentistry (S.R.M., R.T.T., F.A.M.), ACHORD, Li Ka Shing Center, University of Alberta, Edmonton, Alberta, Canada (L.T.); and Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada (S.E.V.).