1. Multiple Sclerosis Centre; Spedali Civili; Montichiari Brescia Italy
2. Department of Neurosciences; San Camillo-Forlanini Hospital, C.ne Gianicolense 87, 00152; Rome Italy
3. Department of Neurology, San Raffaele Scientific Institute; Vita-Salute San Raffaele University; Milan Italy
4. Department of Health Sciences; University of Genoa; Genoa Italy
5. Department of Neuroradiology, San Raffaele Scientific Institute; Vita-Salute San Raffaele University; Milan Italy