1. Neuroimmunology and Multiple Sclerosis Unit, Department of Neurology, Hospital Universitario La Paz & Institute for Health Research–IdiPAZ (La Paz University Hospital–Universidad Autónoma de Madrid), Spain
2. Apheresis Unit, Department of Haematology, Hospital Universitario La Paz, Spain
3. Biostatistics Section, Hospital Universitario La Paz & Institute for Health Research–IdiPAZ (La Paz University Hospital–Universidad Autónoma de Madrid), Spain