1. Department of Neurology, Multiple Sclerosis and Neuroinflammation, Pierre Wertheimer Neurological Hospital, Lyon Civil Hospices Lyon France
2. Department of Neurology‐Neuroimmunology, Multiple Sclerosis Center Catalonia, Vall d'Hebron Institute of Research, Vall d'Hebron University Hospital, Autonomous University of Barcelona Barcelona Spain
3. Lyon Neuroscience Research Center, U1028 INSERM, UMR5292 CNRS, FLUID Team Lyon France
4. University of Lyon, Claude Bernard University Lyon 1, Lyon Civil Hospices, EDMUS Foundation, OFSEP, Lyon Neuroscience Research Center Lyon France
5. Department of Neurology Adolphe de Rothschild Hospital Foundation Paris France
6. Department of Neurology and Reference Center for Rare Inflammatory Diseases of the Brain and Bone Pitié‐Salpêtrière Hospital, Public Hospital Network of Paris Paris France
7. Aix‐Marseille University, Public Assistance Hospitals of Marseille, Timone Hospital, Clinical Neuroscience Center, Neurology Department Marseille France
8. Pediatric Neurology Department Timone Hospital, Public Assistance Hospitals of Marseille Marseille France
9. National Referral Center for Neuroinflammatory Diseases and Pediatric Neurology Department Public Hospital Network of Paris, Bicêtre Hospital Le Kremlin‐Bicêtre France
10. Department of Neuropediatrics, University of Paris‐Sud Le Kremlin‐Bicêtre France
11. University Lille, INSERM, CHU Lille, U1172–Laboratory of Neuroinflammation and Multiple Sclerosis, Lille Neuroscience & Cognition Lille France
12. Department of Neurology SEP Resource and Competence Center Lille France
13. Department of Neurology CRC‐SEP, Toulouse University Hospital Toulouse France
14. Department of Neurology and Clinical Investigation Center, INSERM 1434 Strasbourg University Hospital Strasbourg France
15. Department of Neurology Montpellier University Hospital Montpellier France
16. Department of Pediatric Neurology CHU Montpellier, PhyMedExp, University of Montpellier, INSERM, CNRS Montpellier France
17. Department of Neurology Carémeau Hospital, Nimes University Hospital Nimes France
18. Department of Neurology Rouen University Hospital Rouen France
19. Department of Neurology Dupuytren Hospital Limoges France
20. Department of Neurology, CRCSEP, Cote d'Azur Clinical Research Unit, Pasteur University Hospital Center 2 Nice France
21. Division of Immunovirology INSERM, U1184, Center for Immunology of Viral Infections and Autoimmune Diseases, University of Paris‐Sud 11, CEA, DSV/iMETI, IDMIT, Faculty of Medicine Le Kremlin‐Bicêtre France
22. Pediatric Neurology Department, National Referral Center for Rare Inflammatory Brain and Spinal Diseases Public Hospital Network of Paris, University of Paris‐Sud Hospitals, Bicêtre Hospital Le Kremlin‐Bicêtre France
23. Center for Immunology of Viral Infections and Autoimmune Diseases University of Paris‐Sud, UMR 1184‐CEA‐IDMIT Le Kremlin‐Bicêtre France