No abstract available
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Aged
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Coal Mining*
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Dyspepsia / epidemiology*
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England / epidemiology
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Gastrointestinal Neoplasms / diagnosis
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Humans
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Male
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Mass Screening / methods
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Middle Aged
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Occupational Diseases / diagnosis
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Risk Factors