No abstract available
MeSH terms
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Absenteeism
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Adult
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Age Factors
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Air Pollution
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Asthma / epidemiology*
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Bronchitis / epidemiology*
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Chronic Disease
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Epidemiologic Methods
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Female
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Health Surveys
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Humans
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Income
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Insurance, Health
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Male
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Middle Aged
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Residence Characteristics
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Respiration / physiology
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Rural Health
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Rural Population
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Sex Factors
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Smoking
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Spirometry
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Sweden
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Time Factors
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Urban Population