'FlexYonio'; a reliable instrument to support monitoring the length of the long finger flexors in Duchenne muscular dystrophy (DMD). - Houwen-van Opstal SL; Pelsma M; van den Elzen YM; Merkenhof LJ; Popping-De Vries TP; Groothuis JT; van der Holst M; Cup EH (Journal of neuromuscular diseases, 2026)