RT Journal Article SR Electronic T1 Inhaled therapy reduces COPD mortality JF ERJ Open Research JO erjor FD European Respiratory Society SP 00634-2020 DO 10.1183/23120541.00634-2020 VO 6 IS 4 A1 Stefan Andreas A1 Christian Taube YR 2020 UL http://openres.ersjournals.com/content/6/4/00634-2020.abstract AB