1. Institute of Neuroimmunology and Multiple Sclerosis, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
2. Department of Psychology & Methods, Jacobs University Bremen gGmbH, Bremen, Germany;
3. Department of Sport Science and Sport, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany;
4. Department of Physical Therapy, University of Alabama at Birmingham, Birmingham, AL, USA;
5. School of Allied Health and Health Research Institute, University of Limerick, Limerick, Ireland;
6. Institute of Neuroimmunology and Multiple Sclerosis, Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany