![Prevalence and characteristics of COPD among pneumoconiosis patients at an occupational disease prevention institute: A cross-sectional study](https://timtailieu.net/upload/document/564498/w126_h160_prevalence-and-characteristics-of-copd-among-pneumoconiosis-patients-at-an-occupational-disease-prevention-institute-a-cross-sectional-study-564498.jpg)
Prevalence and characteristics of COPD among pneumoconiosis patients at an occupational disease prevention institute: A cross-sectional study
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