[1] Virginia Mason Med Ctr, Seattle, WA 98101 USA
[2] Cleveland Clin, Mellen Ctr Multiple Sclerosis Treatment & Res, Cleveland, OH USA
[3] Ruhr Univ Bochum, St Josef Hosp, Bochum, Germany
[4] Queen Mary Univ London, Blizard Inst, Barts & London Sch Med & Dent, London, England
[5] Baylor Inst Immunol Res, Multiple Sclerosis Program, Dallas, TX USA
[6] Biogen Idec Inc, Cambridge, MA USA
[7] Univ Basel Hosp, Basel Neurol, CH-4031 Basel, Switzerland