Demographic characteristics: Total study participants.
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a p≤0.05—nonsmokers vs. ex-smokersb p≤0.05—nonsmokers vs. active smokerc p≤0.05—ex-smokers vs. active smokers# GOLD classification is as detailed in the Global Initiative for Chronic Obstructive Lung Disease [24].Data are expressed as mean±SEM.
创建时间：
2015-12-03
