[1] Univ Bologna, Dept Neurol Sci, Bologna, Italy
[2] Univ Verona, I-37100 Verona, Italy
[3] UO Neurol Lugo, AUSL Ravenna, Lugo Di Romagna, Italy
[4] Univ Parma, I-43100 Parma, Italy
[5] Inst Neurol Sci, Novara, Italy
[6] UO Neurol Reggio Emilia, Reggio Emilia, Italy
[7] UO Neurol Forli, Forli, Italy
[8] UO Neurol Carpi, Carpi, Italy
[9] Univ Ferrara, I-44100 Ferrara, Italy
[10] AUSL Citta Bologna, Bologna, Italy
[11] Biogen Dompe, Milan, Italy