[1] C. Besta National Neurological Institute,
[2] Milan,undefined
[3] Italy,undefined
[4] Neurology Department,undefined
[5] Parma,undefined
[6] Italy,undefined
[7] Neurology Department,undefined
[8] Bologna University,undefined
[9] Bologna,undefined
[10] Italy,undefined
[11] Glaxo Wellcome Medicines Research Centre,undefined
[12] Neurology and Psychiatry Medical Department,undefined
[13] Via Fleming 4,undefined
[14] I-37100 Verona,undefined
[15] Italy,undefined