Real-world effects of medications for chronic obstructive pulmonary disease: protocol for a UK population-based non-interventional cohort study with validation against randomised trial results

Kevin Wing ; Elizabeth Williamson ; James R Carpenter ; Lesley Wise ; Sebastian Schneeweiss ; Liam Smeeth ; Jennifer K Quint ; Ian Douglas ; (2018) Real-world effects of medications for chronic obstructive pulmonary disease: protocol for a UK population-based non-interventional cohort study with validation against randomised trial results. BMJ OPEN, 8 (3). ISSN 2044-6055 DOI: 10.1136/bmjopen-2017-019475