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