No abstract available
Publication types
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Comparative Study
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Letter
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Research Support, N.I.H., Extramural
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Adult
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Aged
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Aged, 80 and over
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Cross-Sectional Studies
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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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Population Surveillance
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Prevalence
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Pulmonary Disease, Chronic Obstructive / epidemiology*
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Pulmonary Disease, Chronic Obstructive / physiopathology*
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Rural Population / statistics & numerical data*
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United States / epidemiology
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Urban Population / statistics & numerical data*