1. Department of Psychiatry and Psychotherapy, University of Tübingen, Germany
2. Department of Neurology, University of Regensburg, Germany
3. Department of Psychology I, University of Würzburg, Germany
4. Department of Neurology, University of Essen, Germany
5. Kiel Headache Center, Kiel, Germany
6. Department of Psychiatry, Psychotherapy and Psychosomatics, Medical School, RWTH Aachen University, Germany
7. Department of Neurology, Helios Klinikum, Germany
8. Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Germany