For citations:
Lyubavina N.A., Makarova E.V., Menkov N.V., Mayorova L.V., Shonia M.L., Presnyakova N.B., Korolyeva V.V., Varvarina G.N., Novikov V.V. Clinical course of chronic obstructive pulmonary disease in dependence on smoking duration and the immune status of patients. PULMONOLOGIYA. 2013;(4):52-55. (In Russ.) https://doi.org/10.18093/0869-0189-2013-0-4-52-55
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