No abstract available
MeSH terms
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Case-Control Studies
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China / epidemiology
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Cohort Studies
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Duodenal Neoplasms* / epidemiology
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Duodenal Neoplasms* / etiology
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Duodenal Neoplasms* / pathology
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Esophageal Neoplasms* / epidemiology
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Esophageal Neoplasms* / etiology
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Helicobacter Infections / complications
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Helicobacter Infections / epidemiology
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Helicobacter Infections / microbiology
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Helicobacter pylori
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Humans
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Risk Factors
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Stomach Neoplasms* / epidemiology
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Stomach Neoplasms* / etiology
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Stomach Neoplasms* / microbiology
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Stomach Neoplasms* / pathology