Correction for: Cumming SA, Jimenez-Moreno C, Okkersen K, Wenninger S, Daidj F, Hogarth F, Littleford R, Gorman G, Bassez G, Schoser B, Lochmüller H, van Engelen BGM, Monckton DG; OPTIMISTIC Consortium. Genetic determinants of disease severity in the myotonic dystrophy type 1 OPTIMISTIC cohort...