[1] Fdn IRCCS Ist Neurol C Besta, Unit Neuroepidemiol, Via Celoria 11, I-20133 Milan, Italy
[2] Univ Kent, Tizard Ctr, Canterbury, Kent, England
[3] Fdn IRCCS Ist Neurol Carlo Besta, Unit Neuroepidemiol, Milan, Italy
[4] Univ Turin, Dept Psychol, Turin, Italy
[5] Univ Autonoma Barcelona, Hosp Univ Vall dHebron, Dept Neurol Neuroimmunol, Multiple Sclerosis Ctr Catalonia Cemcat, Barcelona, Spain
[6] Univ Cologne, Inst Clin Nursing Sci, Cologne, Germany
[7] Univ Med Ctr Hamburg Eppendorf, Inst Neuroimmunol & Multiple Sclerosis, Hamburg, Germany
[8] Behandlungszentrum Kempfenhausen Multiple Skleros, Marianne Strauss Klin, Berg, Germany
[9] European Acad Neurol, Vienna, Austria
[10] Univ Siena, Dept Life Sci, Siena, Italy
[11] People MS Advisory Comm, Multiple Sclerosis Int Federat, Copenhagen, Denmark
[12] Fdn IRCCS Casa Sollievo Sofferenza, Unit Biostat, San Giovanni Rotondo, Italy
[13] Univ Belgrade, Neurol Clin, CCS, Fac Med, Belgrade, Serbia
[14] Nieuw Unicum, Zandvoort, Netherlands
[15] Med Univ Sofia, Sofia, Bulgaria
[16] Barzilai Govt Hosp, Dept Neurol, Ashqelon, Israel
[17] Ben Gurion Univ Negev, Fac Hlth Sci, Beer Sheva, Israel
[18] Univ Belgrade, Fac Med, Belgrade, Serbia
[19] Israel Multiple Sclerosis Soc, Tel Aviv, Israel
[20] Kings Coll Hosp NHS Fdn Trust, Dept Neurol, London, England
[21] FARO Charitable Fdn, Turin, Italy
[22] Univ Hosp Policlin Vittorio Emanuele, Multiple Sclerosis Ctr, Neurol Clin, Catania, Italy
[23] Univ Cologne, Fac Med, Dept Palliat Med, Cologne, Germany
[24] Univ Cologne, Univ Hosp, Cologne, Germany
[25] Univ Cologne, Fac Med, Ctr Hlth Serv Res ZVFK, Cologne, Germany