1. From the Division of Neurology (A.Y.X.Y.), Department of Medicine, University of Toronto, Sunnybrook Health Sciences Centre, Ontario, Canada
2. Division of General Internal Medicine, Department of Medicine, University of Toronto-University Health Network (M.K.K.), Ontario, Canada
3. Research and Analysis Department, Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada (J.F.).
4. Division of General Internal Medicine (D.A.R.), Department of Medicine, University of Toronto, Sunnybrook Health Sciences Centre, Ontario, Canada