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(a) 6MWD in meters (mean ± SEM) for DMD patients <7 years old treated with steroids (n = 6) and steroid-naive patients (N = 8). (b) 6MWD in meters (mean ± SEM) for DMD patients ≥7 years old treated with steroids (N = 34) and steroid-naive subjects (N = 9).
