[1] Univ Florence, Dept Neurol, I-50134 Florence, Italy
[2] Univ Milan, San Raffaele Inst, Milan, Italy
[3] Hosp Gallarate, Gallarate, VA, Italy
[4] Univ Catania, Dept Neurol, Catania, Italy
[5] Besta Inst, Milan, Italy
[6] Univ Genoa, Dept Neurol, Genoa, Italy
[7] ASL3 Genovese, Dept Neurol, Genoa, Italy
[8] Univ Ferrara, Dept Neurol, I-44100 Ferrara, Italy
[9] Univ Roma La Sapienza, S Andrea Hosp, Dept Neurol Sci, Multiple Sclerosis Ctr, Rome, Italy
[10] Univ Aquila, Dept Neurol, I-67100 Laquila, Italy
[11] Univ G DAnnunzio, Dept Neurosci & Imaging, Chieti, Italy
[12] Univ Bari, Dept Neurol, Bari, Italy
[13] Univ Cagliari, Dept Neurol, Cagliari, Italy
[14] Consorzio Mario Negri Sud, Dept Clin Pharmacol & Epidemiol, Chieti, Italy
[15] Sci Inst Casa Sollievo della Sofferenza, Biostat Unit, Foggia, Italy