No abstract available
MeSH terms
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Adult
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Age Factors
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Female
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Gallbladder Diseases / diagnostic imaging
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Gallbladder Diseases / epidemiology*
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Humans
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Japan / epidemiology
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Male
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Middle Aged
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Polyps / diagnostic imaging
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Polyps / epidemiology*
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Rural Population
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Sex Factors
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Ultrasonography
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Urban Population