[1] Univ Campania Luigi Vanvitelli, Dept Med Surg Neurol Metab & Aging Sci, Clin Neurol 1, Piazza Miraglia 2, I-80138 Naples, Italy
[2] Univ Verona, Dept Neurosci Biomed & Movement Sci, Verona, Italy
[3] Hosp Franz Tappeiner, Dept Neurol, Merano, Italy
[4] Univ Naples Federico II, Multiple Sclerosis Clin Care & Res Ctr, Dept Neurosci Reprod Sci & Odontostomatol, Naples, Italy
[5] UCL, Inst Neurol, Queen Sq Multiple Sclerosis Ctr, London, England
[6] Univ Hosp San Raffaele, Dept Neurol, Milan, Italy
[7] Univ Hosp San Raffaele, Inst Expt Neurol INSPE, Milan, Italy
[8] Univ Turin, AOU San Luigi Gonzaga, Dept Clin & Biol Sci, Orbassano, Italy
[9] Queen Mary Univ London, Blizard Inst Neurosci, Barts & London Sch Med & Dent, London, England
[10] Barts Hlth NHS Trust, Clin Board Med Neurosci, Royal London Hosp, London, England
[11] Mons L Novarese Hosp, Dept Rehabil, Moncrivello, Italy
[12] S Camillo Forlanini Hosp, Dept Neurosci, Rome, Italy