1. Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
2. Departments of Psychiatry and Neurology, University of California, San Francisco, VAMC, San Francisco, CA, USA
3. Netherlands Institute for Neuroscience and MS Centre, VUmc, AZ Amsterdam, The Netherlands
4. Klinik und Poliklinik für Neurologie, Universitätsklinikum Leipzig, Leipzig, Germany
5. Klinische Psychologie und Psychotherapie, Psychologisches Institut, Universitäat Zürich, Zürich, Switzerland
6. Department of Psychiatry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
7. Multiple Sclerosis Program, Department of Neurology and Cousins Center for Psychoneuroimmunology, Neuropsychiatric Institute, UCLA School of Medicine, Los Angeles, CA, USA