No abstract available
MeSH terms
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Biomarkers, Tumor / blood*
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Bronchitis / blood*
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Chronic Disease
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Follow-Up Studies
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Humans
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Immunoenzyme Techniques*
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Immunoradiometric Assay*
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Keratins / analysis*
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Lung Neoplasms / blood*
Substances
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Biomarkers, Tumor
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Keratins