1. From the Departments of Neurology (A.B.M., J.W.C., M.J.S., S.J.K.) and Medicine (P.F.M., Y.-C.C., K.A.R., B.D.M.), University of Maryland School of Medicine, Baltimore; and Department of Veterans Affairs and Veterans Affairs Medical Center Baltimore, MD (J.W.C., Y.-C.C., S.J.K.).