title: Natural history of SMA IIIb: muscle strength decreases in a predictable sequence and magnitude.
authors.forename: S
authors.initials: S
authors.lastname: Piepers
authors.forename: W-L
authors.initials: WL
authors.lastname: van der Pol
authors.forename: F
authors.initials: F
authors.lastname: Brugman
authors.forename: J H J
authors.initials: JH
authors.lastname: Wokke
authors.forename: L H
authors.initials: LH
authors.lastname: van den Berg
mesh_terms: D001132:Arm / Q000294:innervation / Q000503:physiopathology; D004185:Disability Evaluation; D018450:Disease Progression; D006801:Humans; D007866:Leg / Q000294:innervation / Q000503:physiopathology*; D053580:Muscle Strength / Q000502:physiology; D018908:Muscle Weakness / Q000209:etiology / Q000473:pathology / Q000503:physiopathology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000503:physiopathology*; D009460:Neurologic Examination; D016658:Psoas Muscles / Q000294:innervation / Q000503:physiopathology; D052097:Quadriceps Muscle / Q000294:innervation / Q000503:physiopathology; D014897:Spinal Muscular Atrophies of Childhood / Q000473:pathology / Q000503:physiopathology*