No abstract available
MeSH terms
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Adult
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Aged
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Emigration and Immigration
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Female
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Gastritis / epidemiology
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Gastritis / ethnology*
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Gastritis / microbiology
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Helicobacter Infections / epidemiology
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Helicobacter Infections / ethnology*
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Helicobacter pylori*
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Humans
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Japan / ethnology
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Male
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Middle Aged
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Peru / epidemiology