No abstract available
MeSH terms
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Clinical Trials as Topic
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Diet / adverse effects
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Dietary Supplements / adverse effects*
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Neoplasms / etiology
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Neoplasms / prevention & control*
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Risk Factors
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Trace Elements / adverse effects*
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Vitamins / adverse effects*
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beta Carotene / adverse effects
Substances
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Trace Elements
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Vitamins
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beta Carotene