No abstract available
MeSH terms
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Aged
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Arthritis, Rheumatoid / complications
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Arthritis, Rheumatoid / epidemiology
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Caplan Syndrome / diagnostic imaging
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Caplan Syndrome / epidemiology
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Caplan Syndrome / etiology*
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Coal Mining*
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Czechoslovakia
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Environmental Exposure
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Germany, West
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Humans
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Male
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Middle Aged
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Occupational Diseases / epidemiology*
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Radiography
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Rheumatoid Factor / analysis
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Silicon Dioxide
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Silicosis / complications
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Silicotuberculosis / epidemiology
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Wales
Substances
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Silicon Dioxide
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Rheumatoid Factor