Demographic characteristics: Total study participants.
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a p≤0.05—nonsmokers vs. ex-smokers b p≤0.05—nonsmokers vs. active smoker c 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：
2015-09-11
