BibTex format
@article{Buttery:2018:10.1136/bmjopen-2017-021368,
author = {Buttery, S and Kemp, S and Shah, P and Waller, D and Jordan, S and Lee, JL and Banya, W and Steiner, M and Hopkinson, N},
doi = {10.1136/bmjopen-2017-021368},
journal = {BMJ Open},
title = {The CELEB trial: Comparative effectiveness of lung volume reduction surgery for emphysema and bronchoscopic lung volume reduction with valve placement. A protocol for a randomised controlled trial},
url = {http://dx.doi.org/10.1136/bmjopen-2017-021368},
volume = {8},
year = {2018}
}