1. IRCCS Fondazione Don Carlo Gnocchi Onlus, 20148 Milan, Italy
2. Department of Rehabilitation, Centro di Recupero e Rieducazione Funzionale (CRRF) “Mons. Luigi Novarese”, 13040 Moncrivello, Italy
3. Neurology Unit, Galliera Hospital, 16128 Genova, Italy
4. Italian Multiple Sclerosis Foundation, Scientific Research Area, 16126 Genoa, Italy
5. IRCCS Foundation “Carlo Besta” Neurological Institute, 20133 Milan, Italy
6. Department of Physiopathology and Transplants, University of Milan, 20122 Milan, Italy