GGPS1 and myotonic dystrophy type 1: Among the participants with muscular dystrophy, four were diagnosed with Steinert’s disease, two with facioscapulohumeral dystrophy, three with Emery-Dreifuss muscular dystrophy, three with limb-girdle muscular dystrophy, and one with muscular dystrophy due to a GGPS1 mutation.