"Lung volume reduction in emphysema: a pragmatic prospective cohort study". Christophe Dooms, Astrid Blondeel, Laurens J. Ceulemans, Johan Coolen, Stephanie Everaerts, Heleen Demeyer, Thierry Troosters Geert Verleden, Dirk Van Raemdonck and Wim Janssens. ERJ Open Res 2021; 7: 00877-2020. Issue 2 (21st June 2021) - Unknown