No abstract available
MeSH terms
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Adult
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Age Factors
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Air Pollution
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Bronchitis / epidemiology
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Environmental Exposure
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Epidemiologic Methods
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Humans
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Iron
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Male
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Middle Aged
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Mining*
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Occupational Diseases / epidemiology*
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Respiratory Tract Diseases / epidemiology*
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Respiratory Tract Diseases / physiopathology
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Smoking / complications
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Spirometry*
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Sweden