For citations:
Zykov K.A., Rvacheva A.V., Kobylyanskiy V.I., Osipova G.L., Tatarskiy A.R., Sokolov E.I. Chronic obstructive pulmonary disease: mono-, double-, triple therapy…. PULMONOLOGIYA. 2018;28(2):234-242. (In Russ.) https://doi.org/10.18093/0869-0189-2018-28-2-234-242