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. 2020 Feb 13;15:367–377. doi: 10.2147/COPD.S234042

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© 2020 Wang et al.

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Geographical disparities and spatial clusters of COPD prevalence among different subpopulations in mainland China, 2015. (A) Overall population. (B) Subpopulation aged 40 to 59. (C) Subpopulation aged 40 to 59 without a history of smoking.