A collaborative study on the natural history of childhood and juvenile onset proximal spinal muscular atrophy (type II and III SMA): 569 patients

We analyzed clinical data of 569 patients in two combined series with childhood and juvenile proximal SMA. This cohort included only patients who had achieved the ability to sit unaided (type II and III SMA). The survival rate among 240 type II patients (who sat but never walked) was 98.5% at 5 year...

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