1. From the Departments of Neuroradiology (C.H., S.N., M.B.), Medical Biometry and Informatics (L.U.), and Neurology (M.S., T.S.), University of Heidelberg, Germany; Department of Neurology, Frankfurt Hoechst Hospital, Frankfurt am Main, Germany (T.S.); and Department of Neurology, St. John’s Hospital Vienna, Austria (M.S.).