1. C.R.E.A. Sanità, University of Rome Tor Vergata, Rome, Italy
2. Multiple Sclerosis Center, Spedali Civili of Brescia, Brescia, Italy
3. Biogen Italia S.R.L., Milan, Italy
4. U.O. Neurology, P.O. Dimiccoli, Barletta, Italy
5. Department of Neurosciences, San Camillo-Forlanini Hospital, Rome, Italy