Long-term self-reported attendance in exercise training or lung choir and status of quality of life following initial pulmonary rehabilitation for COPD - Kaasgaard, Mette; Bodtger, Uffe; Skou, Søren T.; Clift, Stephen; Hilberg, Ole; Rasmussen, Daniel Bech; Løkke, Anders (Frontiers in Rehabilitation Sciences, 2024)