Association between habitual physical activity (HPA) and sleep quality in patients with cystic fibrosis - Dietz-Terjung, Sarah; Gruber, Wolfgang; Sutharsan, Sivagurunathan; Schöbel, Christoph; Taube, Christian; Olivier, Margarete; Mellies, Uwe; Koerner-Rettberg, Cordula; Dillenhöfer, Stefanie; Stehling, Florian; Welsner, Matthias (Journal of Thoracic Disease, 2020)