1. From the Departments of Neurology (S.P.), Radiology (C.B.), and Medicine (P.P.), University of Texas Health Science Center, San Antonio, TX; University of Alabama at Birmingham (L.A.M.); Department of Medicine (Neurology), University of British Columbia, Vancouver, British Columbia, Canada (O.R.B.); and Department of Medicine (Neurology), McMaster University/Population Health Research Institute Hamilton, Ontario, Canada (R.G.H.).