1Multiple Sclerosis International Federation, London, UK
2McKing Consulting Corporation, Atlanta, GA USA
3EA 7449 REPERES, Epidemiology, Ecole des Hautes Etudes en Sante Publique, Rennes, France
4Internal Medicine, University of Manitoba, Winnipeg, MB, Canada.
5Institute of Psychological Medicine and Clinical Neuroscience, Cardiff University, Cardiff, UK
6National MS Society, West Bath, ME, USA
7Neurology, Amsterdam UMC–Locatie VUMC, Amsterdam, Netherlands
8Menzies Research Institute, University of Tasmania, Hobart, Tas, Australia
9Department of Neurology, George Washington University, Washington, DC, USA