1. Cuban Multiple Sclerosis Society and International Neurological Restoration Center, Havana, Cuba
2. Department of Neurology, Pierre Zobda Quitman Hospital, Fort de France, Martinique, French West Indies
3. Institute of Neurology and Neurosurgery, Havana, Cuba. Calle 29 y D, Vedado, La Habana, Cuba
4. Service of Neurology Hospital Clinic and Institut d’Invesigación Biomèdica August Pi i Sanyer (IAIBAPS), University of Barcelona, Villarroel, Barcelona, Spain
5. Hôpital Neurologique Pierre Wertheimer, Lyon, France; U842 INSERM, Faculté Laënnec, Lyon Cedex
6. Department of Ophthalmology, Pierre Zobda Quitman Hospital, Fort de France, Martinique, French West Indies
7. Emergency Department, Pierre Zobda Quitman Hospital, Fort de France, Martinique, French West Indies
8. Sancti Spiritus Children Hospital, Sancti Spiritus, Cuba