Medical Progress

From the Division of Neurology, Department of Medicine (A.E.L.), and the Division of Neurosurgery, Department of Surgery (A.M.L.), University of Toronto and the Toronto Hospital; and the Morton and Gloria Shulman Movement Disorders Center, the Toronto Hospital (A.E.L.) - all in Toronto. Address reprint requests to Dr. Lang at Toronto Hospital, 399 Bathurst St., MP 11, Toronto, ON M5T 2S8, Canada.