1. Clinical and Rehabilitative MS Research, Institute of Neuroimmunology and Multiple Sclerosis, University Medical Center, Hamburg, Germany
2. Department of Clinical Psychology, University of Bern, Bern, Switzerland
3. Department of Medical Statistics, University Medical Center Göttingen, Göttingen, Germany
4. GAIA AG, Hamburg, Germany
5. Department of General Practice and Primary Care, University Medical Center Hamburg-Eppendorf, Hamburg, Germany