1. Neurology Unit, Department of Neuroscience and Sense Organs, A.C.O San Filippo Neri, Via G. Martinotti 20, 00135 Rome, Italy
2. Clinical Neurobiology Unit, Regional Referring Multiple Sclerosis Centre (CReSM), University Hospital San Luigi Gonzaga, Orbassano, 10043 Turin, Italy
3. Department of Neurology, A.O. San Camillo Forlanini Hospital, Circonvallazione Gianicolense 87, 00152 Rome, Italy
4. Multiple Sclerosis Study Centre, Gallarate Hospital, Via Pastori 4, 21013 Gallarate, Italy
5. Neurology Unit, A.O. Garibaldi Nesima, Piazza Santa Maria Del Gesù 5, 95122 Catania, Catania, Italy
6. Neurology Unit, Department Head and Neck, ASL3 Genovese, Via D. Oliva 22, 16154 Genoa, Italy