Associations of paediatric demyelinating and encephalitic syndromes with myelin oligodendrocyte glycoprotein antibodies: a multicentre observational study - Armangue, T; Olivé-Cirera, G; Martínez-Hernandez, E; Sepulveda, M; Ruiz-Garcia, R; Muñoz-Batista, M (Lancet Neurol, 2020)