No abstract available
MeSH terms
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Adult
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Asthma / complications
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Asthma / epidemiology*
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Bronchitis / complications
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Bronchitis / epidemiology*
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Chronic Disease
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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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Physical Exertion
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Respiratory Tract Diseases / epidemiology
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Rural Population
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Sex Factors
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Smoking / complications*
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Surveys and Questionnaires
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Sweden
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Urban Population