No abstract available
MeSH terms
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Adult
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Bronchitis / epidemiology*
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Chronic Disease
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Forced Expiratory Volume
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Humans
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Lung Diseases, Obstructive / diagnosis
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Lung Diseases, Obstructive / epidemiology*
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Male
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Middle Aged
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Pneumoconiosis / chemically induced*
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Pulmonary Ventilation
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Romania
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Ships
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Welding*