title: The natural history of Duchenne muscular dystrophy: a caveat for therapeutic trials.
mesh_terms: D002648:Child; D002675:Child, Preschool; D003286:Contracture / Q000453:epidemiology / Q000209:etiology; D006801:Humans; D008168:Lung / Q000503:physiopathology; D009136:Muscular Dystrophies / Q000150:complications / Q000503:physiopathology*; D013997:Time Factors