Prevalence and influencing factors of chronic obstructive pulmonary disease among smokers aged ≥40 years in Qingdao
GENG Chuan-xin, XU Kun, WANG Jun-yu, YANG Hai
South China Journal of Preventive Medicine . 2022, (8): 943 -947 .  DOI: 10.12183/j.scjpm.2022.0943

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