1. Department of Neurology, University of Florence, Florence, Italy
2. Department of Pediatric Neurology, Meyer Hospital, Florence, Italy
3. MS Centre, Hospital of Gallarate, Gallarate, Italy
4. Department of Neurology, University of Catania, Catania, Italy
5. Department of Neurological Sciences, “La Sapienza” University, Rome, Italy
6. Department of Neurology, San Raffaele Scientific Institute, Milan, Italy
7. Department of Neurology, University of Bari, Bari, Italy