No abstract available
MeSH terms
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Bronchitis*
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Classification*
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Diagnosis, Differential*
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Electrocardiography*
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Emphysema*
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Epidemiology*
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Geriatrics*
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Hemoglobinometry*
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Humans
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Middle Aged
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Pulmonary Emphysema*
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Radiography, Thoracic*
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Respiratory Function Tests*
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Smoking*
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Statistics as Topic*
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Terminology as Topic*
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United Kingdom
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United States