No abstract available
MeSH terms
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Adult
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China / epidemiology
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Cross-Sectional Studies
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Humans
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Prevalence
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Pulmonary Disease, Chronic Obstructive / classification
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Pulmonary Disease, Chronic Obstructive / epidemiology
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Pulmonary Disease, Chronic Obstructive / etiology*
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Severity of Illness Index
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Tobacco Smoke Pollution / adverse effects*