The baseline characteristics of study population.
收藏Figshare2015-12-02 更新2026-04-29 收录
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Abbreviations: COPD, chronic obstructive pulmonary disease. Data are expressed as mean (standard deviation or SD) or percentage as indicated.*data not available.**P values were calculated by using unpaired t-test for age, and by χ2 test for other categorical characteristics.
创建时间：
2015-12-02
