1. Pharmaco‐epidemiology and health Services Research Department Rennes University, EHESP, REPERES – EA 7449 Rennes France
2. Neurology Department Univ Rennes, CHU Rennes, Inserm, CIC 1414 [(Centre d'Investigation Clinique de Rennes)] Rennes France
3. Biostatistic Department INSERM UMR 1246 – SPHERE, Nantes University, Tours University Nantes France
4. Nephrology Department Nantes University Hospital Nantes France
5. Nephrology Department Lille University Hospital Lille France
6. Neurology Department Hospices Civils de Lyon, Service de Neurologie, sclérose en plaques, pathologies de la myéline et neuro‐inflammation Bron France
7. Neurology Department Observatoire Français de la Sclérose en Plaques, Centre de Recherche en Neurosciences de Lyon, INSERM 1028 et CNRS UMR 5292 Lyon France
8. Neurology Department Université de Lyon, Université Claude Bernard Lyon 1 Lyon France
9. Neurology Department Eugène Devic EDMUS Foundation against Multiple Sclerosis, State‐Approved Foundation Bron France
10. Neurology Department CHU Pontchaillou Rennes France
11. METIS Department EHESP French School of Public Health Rennes France