For citations:
Protasov A.D., Chebykina A.V., Kostinov M.P., Zhestkov A.V., Chuchalin A.G. Does a combined vaccine against respiratory infection contribute to functional improvement in patients with chronic obstructive pulmonary disease? PULMONOLOGIYA. 2014;(6):49-55. (In Russ.) https://doi.org/10.18093/0869-0189-2014-0-6-49-55