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