No abstract available
Publication types
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Letter
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Randomized Controlled Trial
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Research Support, N.I.H., Extramural
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Research Support, N.I.H., Intramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Adult
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Aged
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China
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Dietary Supplements*
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Double-Blind Method
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Esophageal Neoplasms / diagnosis
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Esophageal Neoplasms / mortality
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Esophageal Neoplasms / prevention & control*
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Female
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Follow-Up Studies
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Humans
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Male
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Middle Aged
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Precancerous Conditions / diagnosis
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Precancerous Conditions / mortality
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Precancerous Conditions / prevention & control*
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Risk Assessment
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Risk Factors
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Stomach Neoplasms / diagnosis
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Stomach Neoplasms / mortality
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Stomach Neoplasms / prevention & control*
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Vitamins / administration & dosage*
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Vitamins / adverse effects
Associated data
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ClinicalTrials.gov/NCT00342654