1. From the Departments of Neurology (E.A.N., H.M.S., C.E.H., A.V.A., Z.G., J.C.G.), and Radiology (E.D.C.), University of Texas-Houston Medical School; the Institute for Neurology and Neurosurgery (J.K.S.), Beth Israel Hospital, New York, NY; and the Alabama Neurological Institute (M.S.C.), Birmingham.