No abstract available
MeSH terms
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Adult
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Airway Obstruction / complications
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Bronchitis / complications
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Coal Mining*
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Cough / complications
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Dyspnea / complications
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Employment
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Humans
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Male
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Middle Aged
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Mortality*
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Occupational Medicine*
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Pneumoconiosis / complications*
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Pneumoconiosis / diagnostic imaging
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Radiography
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Sampling Studies
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Smoking / complications
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Spirometry
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Sputum
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Time Factors
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United States
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Vital Capacity