BibTex format
@article{Ritchie:2020:10.1016/j.ccm.2020.06.007,
author = {Ritchie, A and Wedzicha, JA},
doi = {10.1016/j.ccm.2020.06.007},
journal = {CLINICS IN CHEST MEDICINE},
pages = {421--438},
title = {Definition, Causes, Pathogenesis, and Consequences of Chronic Obstructive Pulmonary Disease Exacerbations},
url = {http://dx.doi.org/10.1016/j.ccm.2020.06.007},
volume = {41},
year = {2020}
}