DMD and Becker muscular dystrophy: Dystrophinopathy, which includes Duchenne muscular dystrophy (DMD, MIM 310200) and Becker muscular dystrophy (BMD, MIM 300376), is an X‐linked recessive neuromuscular disorder that occurs from mutations in the DMD gene and its prevalence ranges from of 15.9 to 19.5 per 100,000 live male births.1