1. From the Department of Neurology (S.I.S.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Mass; Veterans Administration (R.L.), Jamaica Plains, Mass; Boehringer Ingelheim Pharma (E.B.), Ingelheim, Germany; Department of Neurology (W.H.), University of Heidelberg, Heidelberg, Germany; and Department of Neurology (M.F.), University of Massachusetts Medical Center, Worcester, Mass.