T.P.38: Initial validity and test–retest reliability of ACTIVE-seated (Ability Captured Through Interactive Video Evaluation-seated) as an upper extremity outcome in Duchenne muscular dystrophy - Lowes, L.P.; Alfano, L.N.; Berry, K.M.; Yin, H.; Dvorchik, I.; Flanigan, K.M.; Mendell, J.R. (Neuromuscular disorders : NMD, 2014)