[Waning and waxing phenomena in neuromuscular diseases in children].
D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000503:physiopathology; D004594:Electrophysiology; D006801:Humans; D007223:Infant; D009133:Muscular Atrophy / Q000503:physiopathology; D009135:Muscular Diseases / Q000503:physiopathology; D009136:Muscular Dystrophies / Q000151:congenital; D009468:Neuromuscular Diseases / Q000503:physiopathology*