[1] Univ Basel Hosp, Dept Neurol, CH-4031 Basel, Switzerland
[2] Univ Basel Hosp, Dept Biomed, CH-4031 Basel, Switzerland
[3] St Michaels Hosp, MS Clin, Toronto, ON M5B 1W8, Canada
[4] Vrije Univ Amsterdam Med Ctr, NL-1007 MB Amsterdam, Netherlands
[5] Univ Lille Nord France, Dept Neurol, Clin Neurol, Hop Roger Salengro,CHU Lille, F-59037 Lille, France
[6] Univ Munster, Dept Neurol Inflammatory Dis Nervous Syst & Neuro, Neurol Clin, D-48149 Munster, Germany
[7] Biogen Idec Inc, Weston, MA 02493 USA