[1] Ctr Neurol, Lodz, Poland
[2] Royal Holloway Univ London, Dept Psychol, Egham, Surrey, England
[3] Univ Bordeaux, INSERM U 1215, Bordeaux, France
[4] Charles Univ Prague, Med Fac 1, Prague, Czech Republic
[5] Univ Newcastle, Newcastle, NSW, Australia
[6] John Hunter Hosp, Div Neurol, Newcastle, NSW, Australia
[7] Univ Hosp Vall Hebron, Dept Neurol Neuroimmunol, Ctr Multiple Sclerosis Catalonia Cemcat, Barcelona, Spain
[8] Univ Catania, GF Ingrassia, Dept Med & Surg Sci & Adv Technol, Catania, Italy
[9] Univ Catania, Azienda Osped Univ Policlin G Rodolico San Marco, Catania, Italy
[10] Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden
[11] Fdn IRCCS Ist Neurol Carlo Bes, Unit Neuroepidemiol, Milan, Italy
[12] Healthcare Business Merck KGaA, Darmstadt, Germany