Ganzoni, C., Arslani, K., Pfister, O., Freese, M., Strobel, W., Mueller, C. and Tobler, D. 2020. Choir singing improves respiratory muscle strength and quality of life in patients with structural heart disease – HeartChoir: a randomised clinical trial. Swiss Medical Weekly. 150, 3738 (Sep. 2020), w20346. DOI:https://doi.org/10.4414/smw.2020.20346.