1. Department of Neurology; Mayo Clinic College of Medicine; Rochester MN
2. Hôpital Pasteur, Service de Neurologie; Nice France
3. Department of Neurology; Cerrahpasa School of Medicine, University of Istanbul; Istanbul Turkey
4. Department of Neurology; Multiple Sclerosis Center, Keck School of Medicine of the University of Southern California; Los Angeles CA
5. Mt. Sinai School of Medicine; New York NY
6. MS Center of Catalunya Cemcat, Vall d'Hebron Hospital; Barcelona Spain
7. Department of Neurology & Neurotherapeutics; Clinical Center for Multiple Sclerosis, Multiple Sclerosis and NeuroImmunology Imaging ProgramUniversity of Texas Southwestern Medical Center; Dallas TX
8. Service de Neurologie, Hôpital Neurologique; Bron France
9. Department of Neurology; University of Florence; Florence Italy
10. Department of Neurology; Neurosurgery and Behavioral Sciences, University of Siena; Siena Italy
11. Department of Health Sciences (DISSAL); University of Genoa; Genoa Italy