1. Department of Immunology, Multiple Sclerosis Unit, Hospital Ramón y Cajal, Madrid, Spain
2. Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, Madrid, Spain
3. Red Española de Esclerosis Múltiple, REEM, Madrid, Spain
4. Department of Neurology, Multiple Sclerosis Unit, Hospital Ramón y Cajal, Madrid, Spain
5. Department of Medicine, University of Alcalá, Alcalá de Henares, Madrid, Spain