No abstract available
MeSH terms
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Adult
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Cellulitis / epidemiology*
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Common Cold / epidemiology*
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Cough / epidemiology*
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Hemoptysis / epidemiology*
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Humans
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Male
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Massachusetts
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Respiratory Function Tests
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Respiratory Insufficiency / epidemiology*
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Respiratory Tract Diseases / etiology*
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School Health Services
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Smoking*
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Statistics as Topic
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Universities