BibTex format
@inproceedings{Cazzola:2018:10.1183/13993003.congress-2018.PA615,
author = {Cazzola, M and Calzetta, L and Barnes, PJ and Criner, GJ and Martinez, FJ and Papi, A and Matera, MG},
doi = {10.1183/13993003.congress-2018.PA615},
publisher = {EUROPEAN RESPIRATORY SOC JOURNALS LTD},
title = {Efficacy and safety profile of xanthines in COPD: a network meta-analysis},
url = {http://dx.doi.org/10.1183/13993003.congress-2018.PA615},
year = {2018}
}