[1] Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden
[2] MSBase Fdn, Melbourne, Vic, Australia
[3] Rigshosp, Danish Multiple Sclerosis Registry, Dept Neurol, Copenhagen, Denmark
[4] Univ Copenhagen, Danish Multiple Sclerosis Ctr, Dept Neurol, Copenhagen, Denmark
[5] Monash Univ, MS & Neuroimmunol Res, Cent Clin Sch, Alfred & Box Hill Hosp, Melbourne, Vic, Australia
[6] Hosp Civils Lyon, Hop Neurol Pierre Wertheimer, Serv Neurol Sclerose Plaques Pathol Myeline & Neu, Lyon, France
[7] Observ Francais Sclerose Plaques, Lyon, France
[8] INSERM, Ctr Neurosci Lyon, Lyon, France
[9] Univ Claude Bernard Lyon 1, Fac Med Lyon Est, Lyon, France
[10] Univ Bari Aldo Moro, Dept Basic Med Sci Neurosci & Sense Organs, Bari, Italy
[11] Biogen Int GmbH, Zug, Switzerland