1 Department of Neurology (S.M.P., N.E.J.), University of Utah, Salt Lake City; Hôpital de la Salpêtrière (A.D.), Paris, France; Hôpital Erasme (M.P.), Université Libre de Bruxelles, Belgium; University of Chicago Medical Center (R.P.R.); and University of Miami (J.M.V.), FL.