1. Department of Medical Sciences and Public Health, Institute of Neurology, University Hospital D. Casula Monserrato, Monserrato (Cagliari), Italy
2. Department of Medical Sciences and Public Health, Institute of Rheumatology, University Hospital D. Casula Monserrato, Monserrato (Cagliari), Italy
3. Multiple Sclerosis Center, Binaghi Hospital, Cagliari, Italy