1. National Multiple Sclerosis Society, New York, NY, USA
2. Mellen Center for Multiple Sclerosis, Cleveland Clinic, Cleveland, OH, USA
3. Multiple Sclerosis Society of Canada, Toronto, ON, Canada
4. Division of Extramural Research, National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health, Bethesda, MD, USA
5. Institute of Neurology, Faculty of Brain Sciences, University College London, London, UK