1. From the Division of Neurology (M.V.V., D.L.R.), Department of Medicine, University of Toronto; St. Michael's Hospital-Unity Health Toronto (M.V.V., D.L.R.); ICES (M.V.V., M.K.K., R.A., J.F.); and Division of General Internal Medicine (M.K.K.), Department of Medicine, University of Toronto, Ontario, Canada.