1. Department of Neurology, St Josef-Hospital Bochum (D.R., D.B., C.K.), Ruhr University Bochum, Germany.
2. Medical Faculty (J.E., R.W., C.K.), Ruhr University Bochum, Germany.
3. Department of Neurology, Gemeinschaftskrankenhaus Herdecke, Germany (J.E.).
4. Department of Neurology, Alfried Krupp Krankenhaus Essen, Germany (R.W.).
5. Department of Neurology, Klinikum der Stadt Ludwigshafen, Germany (A.G.).
6. Department of Neurology, University of Heidelberg, Germany (W.H.).