No abstract available
Publication types
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Clinical Trial
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Letter
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Randomized Controlled Trial
MeSH terms
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Adenomatous Polyposis Coli / prevention & control*
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Colonoscopy
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Double-Blind Method
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Female
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Folic Acid / therapeutic use*
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Humans
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Male
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Middle Aged
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Neoplasm Recurrence, Local / prevention & control*
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Prospective Studies