No abstract available
MeSH terms
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Antibodies, Antinuclear / analysis*
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Caplan Syndrome / diagnostic imaging
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Caplan Syndrome / epidemiology*
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Caplan Syndrome / immunology
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Coal Mining*
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Fluorescent Antibody Technique
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Humans
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Male
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Middle Aged
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Pennsylvania
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Pneumoconiosis / diagnostic imaging
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Pneumoconiosis / immunology*
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Radiography
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Rheumatoid Factor / analysis*
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West Virginia
Substances
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Antibodies, Antinuclear
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Rheumatoid Factor