1. Biodonostia Health Research Institute, Multiple Sclerosis Group, San Sebastian, Spain
2. Spanish Network of Multiple Sclerosis, Barcelona, Spain
3. Osakidetza Basque Health Service, Donostia University Hospital, San Sebastian, Spain
4. Biodonostia Health Research Institute, Neuromuscular Diseases Group, San Sebastian, Spain
5. Biodonostia Health Research Institute, Primary Care Unit, San Sebastian, Spain
6. CIBER de Enfermedades Respiratorias (CIBERES), Madrid, Spain
7. CIC biomaGUNE, Molecular and Functional Biomarkers Group, San Sebastian, Spain
8. Biodonostia Health Research Institute, Cellular Oncology Group, San Sebastian, Spain
9. CIBER de Fragilidad y Envejecimiento Saludable (CIBERfes), Madrid, Spain
10. IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
11. Health Services Research on Chronic Patients Network (REDISSEC), Madrid, Spain
12. CIBERNED, Madrid, Spain