<div>Supplementary files to support a manuscript on the development of a new quality of life questionnaire in DMD: the DMD-QoL. <br></div><div><br></div><div>The research is part of the <i>Producing a preference-based quality of life measure for people with Duchenne muscular dystrophy </i>project and is funded as part of project HERCULES led by Duchenne UK.</div><div><br></div><div><div>A protocol for the work is available online: Powell et al. (2019), <a href="http://dx.doi.org/10.1136/bmjopen-2018-023685" target="_new">http://dx.doi.org/10.1136/bmjopen-2018-023685</a></div><div><br></div><div>The research received ethical approval from the UK National Health Service (NHS REC reference: 18/SW/0055). </div></div>