BibTex format
@article{Lewis:2019:10.1136/bmjopen-2018-025048,
author = {Lewis, A and Axson, E and Potts, J and Tarnowska, R and Vioix, H and Quint, J},
doi = {10.1136/bmjopen-2018-025048},
journal = {BMJ Open},
title = {Protocol for a systematic literature review and network meta-analysis of the clinical benefit of inhaled maintenance therapies in chronic obstructive pulmonary disease (COPD)},
url = {http://dx.doi.org/10.1136/bmjopen-2018-025048},
volume = {9},
year = {2019}
}