No abstract available
MeSH terms
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Antioxidants / administration & dosage
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Antioxidants / adverse effects*
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Clinical Trials as Topic
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Dose-Response Relationship, Drug
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Humans
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Lung Neoplasms / chemically induced*
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Lung Neoplasms / prevention & control
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Smoking / adverse effects*
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Vitamin A / administration & dosage
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Vitamin A / adverse effects*
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Vitamin A / blood
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beta Carotene / administration & dosage
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beta Carotene / adverse effects*
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beta Carotene / blood
Substances
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Antioxidants
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beta Carotene
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Vitamin A