1. National Multiple Sclerosis Society 733 3rd Ave New York, NY 10017 USA
2. Department of Physical Therapy, Marquette University, Milwaukee, WI, USA
3. Department of Internal Medicine (Neurology), University of Manitoba, Winnipeg, MB, Canada
4. Vollum Institute, Oregon Health & Science University, Portland, OR, USA
5. Center for Neuroinflammation and Neurotherapeutics, Multiple Sclerosis Division, Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA