No abstract available
Publication types
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Letter
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Research Support, Non-U.S. Gov't
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Research Support, N.I.H., Extramural
MeSH terms
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Cost-Benefit Analysis
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Developing Countries*
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Humans
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Income
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Mass Screening
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Pulmonary Disease, Chronic Obstructive* / diagnosis
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Pulmonary Disease, Chronic Obstructive* / epidemiology
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Pulmonary Disease, Chronic Obstructive* / prevention & control