1. 1Department of Neurology, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany
2. 2Department of Psychiatry, Psychotherapy and Psychosomatic Medicine, Klinikum Am Urban, Berlin, Germany
3. 3Department of Neurology, Justus Liebig University, Giessen, Germany
4. 4DRK Schmerz-Zentrum, Mainz, Germany