1. Physiological Psychology, University of Bielefeld, D-33501 Bielefeld, Germany
2. Neurology Department, Kamillus-Clinic, D-53563 Asbach, Germany
3. Neurology Department, Kamillus-Clinic, 0-53563 Asbach, Germany
4. University Clinic of Neurology, Knappschaftskrankenhaus Bochum-Langendreer, D-44892 Bochum, Germany
5. University Clinic of Radiology, Knappschaftskrankenhaus Bochum-Langendreer, D-44892 Bochum, Germany