Nusinersen in patients older than 7 months with spinal muscular atrophy type 1: A cohort study by Aragon-Gawinska, K, Seferian, AM, Daron, A, Gargaun, E, Vuillerot, C, Cances, C, Ropars, J, Chouchane, M, Cuppen, I, Hughes, I, Illingworth, M, Marini-Bettolo, C, Rambaud, J, Taytard, J, Annoussamy, M, Scoto, M, Gidaro, T, Servais, LJP