BibTex format
@article{Cazzola:2018:10.1183/16000617.0010-2018,
author = {Cazzola, M and Calzetta, L and Barnes, PJ and Criner, GJ and Martinez, FJ and Papi, A and Gabriella, Matera M},
doi = {10.1183/16000617.0010-2018},
journal = {European Respiratory Review},
title = {Efficacy and safety profile of xanthines in COPD: a network meta-analysis},
url = {http://dx.doi.org/10.1183/16000617.0010-2018},
volume = {27},
year = {2018}
}