RT Journal Article SR Electronic T1 Pneumonia in exacerbations of COPD: what is the clinical significance? JF ERJ Open Research JO erjor FD European Respiratory Society SP 00282-2019 DO 10.1183/23120541.00282-2019 VO 6 IS 1 A1 Samuel P. Trethewey A1 John R. Hurst A1 Alice M. Turner YR 2020 UL http://openres.ersjournals.com/content/6/1/00282-2019.abstract AB