No abstract available
MeSH terms
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Adult
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Aged
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Duodenal Ulcer / epidemiology
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Duodenal Ulcer / genetics
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Factor Analysis, Statistical
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Female
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Humans
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Male
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Massachusetts
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Methods
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Middle Aged
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Peptic Ulcer / epidemiology
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Peptic Ulcer / etiology
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Peptic Ulcer / genetics*
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Physicians
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Stomach Ulcer / epidemiology
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Stomach Ulcer / genetics