1. From the Max Planck Institute for Neurological Research (J.S., O.Z.W., A.T., C.D., A.J., W.-D.H.), Cologne, Germany; the Departments of Neurology (J.S., O.Z.W., F.-G.L., A.T., C.D., A.J., M.N., W.-D.H.) and Diagnostic Radiology (V.H.), University of Cologne, Germany.