No abstract available
MeSH terms
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Anticarcinogenic Agents / therapeutic use
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Chemoprevention / methods*
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Double-Blind Method
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Humans
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Neoplasms / prevention & control*
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Placebos
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Randomized Controlled Trials as Topic / methods*
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beta Carotene / therapeutic use
Substances
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Anticarcinogenic Agents
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Placebos
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beta Carotene