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