[1] Fdn IRCCS Neurol Inst C Besta, Unit Neuroepidemiol, Milan, Italy
[2] Univ Lubeck, Inst Social Med & Epidemiol, Lubeck, Germany
[3] FARO Charitable Fdn, Turin, Italy
[4] Univ Klinikum Hamburg Eppendorf, Inst Neuroimmunol & Multiple Sklerose INIMS, Hamburg, Germany
[5] Marianne Strauss Klin, Kempfenhausen Ctr Treatment Multiple Sclerosis, Berg, Germany
[6] Univ Siena, Dept Life Sci, Siena, Italy
[7] Univ Hosp Belgrade, Fac Med, CSS, Clin Neurol, Belgrade, Serbia
[8] Nieuw Unicum, Zandvoort, Netherlands
[9] Hosp Valle De Hebron, MS Ctr Catalonia Cemcat, Barcelona, Spain
[10] Univ Sofia, Neurol Clin, Sofia, Bulgaria
[11] Barzilai Govt Hosp, Dept Neurol, Ashqelon, Israel
[12] Univ Hosp Policlin Vittorio Emanuele, Multiple Sclerosis Ctr, Neurol Clin, Catania, Italy
[13] Univ Belgrade, Inst Epidemiol, Fac Med, Belgrade, Serbia
[14] Israel Multiple Sclerosis Soc, Hazafon North Dist, Israel
[15] Univ Hosp Cologne, Dept Palliat Med, Cologne, Germany
[16] Multiple Sclerosis Int Federat, People MS Advisory Comm, Copenhagen, Denmark
[17] Univ Kent, Tizard Ctr, Canterbury, Kent, England