RT Journal Article SR Electronic T1 A systematic evaluation of the diagnostic criteria for COPD and exacerbations used in randomised controlled trials on the management of COPD exacerbations JF ERJ Open Research JO erjor FD European Respiratory Society SP 00136-2019 DO 10.1183/23120541.00136-2019 VO 5 IS 4 A1 Alexander G. Mathioudakis A1 Julie Janner A1 Mia Moberg A1 Pablo Alonso-Coello A1 Jørgen Vestbo YR 2019 UL http://openres.ersjournals.com/content/5/4/00136-2019.abstract AB