No abstract available
MeSH terms
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Adult
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Aged
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Aged, 80 and over
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China / epidemiology
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Female
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Humans
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Male
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Middle Aged
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Pulmonary Disease, Chronic Obstructive / epidemiology*
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Pulmonary Disease, Chronic Obstructive / physiopathology
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Risk Factors
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Smoking
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Surveys and Questionnaires