1. From the Department of Neurology (M.R.P., F.B., C.L.), University of Heidelberg; Department of Neurology (A.J.G.), Klinikum Ludwigshafen; Limbach Laboratory Heidelberg (J.B., C.B.); and the Department of Gastroenterology (J.R.), Theresienkrankenhaus und St. Hedwig-Klinik, Mannheim, Germany.