[1] Ist Sci San Raffaele, I-20132 Milan, Italy
[2] Univ Vita Salute, Dept Neurol, Milan, Italy
[3] Hosp Britan, Buenos Aires, DF, Argentina
[4] Med Univ Graz, Graz, Afghanistan
[5] Univ Bristish Columbia & Vancouver Coastal Hlth, Vancouver, BC, Canada
[6] Carol Davila Univ Med & Pharm, Bucharest, Romania
[7] Karolinska Univ Hosp, Stockholm, Sweden
[8] Univ Tampere, FIN-33101 Tampere, Finland
[9] Walton Ctr Neurol & Neurosurg, Liverpool, Merseyside, England
[10] Neurol Multiple Sclerosis Ctr, Northbrook, IL USA
[11] Royal Melbourne Hosp, Melbourne, Vic, Australia
[12] Hop La Pitie Salpetriere, Paris, France
[13] Univ Dusseldorf, Dusseldorf, Germany
[14] Haukeland Hosp, N-5021 Bergen, Norway
[15] Hosp Univ Vall dHebron, Barcelona, Spain
[16] Univ Pecs, Budapest, Hungary
[17] Ist Sci San Raffaele, I-20132 Milan, Italy