No abstract available
MeSH terms
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Adult
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Aged
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Bronchitis / complications
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Female
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Humans
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Lung Diseases, Obstructive / diagnosis*
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Lung Diseases, Obstructive / epidemiology
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Lung Diseases, Obstructive / etiology
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Lung Diseases, Obstructive / therapy
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Lung Volume Measurements
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Male
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Middle Aged
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Smoking*
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Spirometry
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Time Factors
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United States