Effect of late-onset on multiple sclerosis phenotype and outcome: evidence from a multi-national registry. - Souissi A; Patti F; Spelman T; Chisari C; Gargouri A; John N; Kermode AG; Kalincik T; Butzkueven H; Sajedi SA; Lechner-Scott J; Roos I; et al. (Journal of neurology, 2026)