1. Multiple Sclerosis Society and Multiple Sclerosis Clinic, International Center of Neurological Restoration, Havana, Cuba
2. Neurological Service and Direction Department, Health International Center, La Pradera
3. Laboratory of Experimental Neurology and Immunology, Hospital Clínic Barcelona, Barcelona, Spain
4. Biochemistry Department , Institute of Neurology and Neurosurgery, Havana, Cuba