No abstract available
MeSH terms
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Antioxidants / administration & dosage
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Antioxidants / adverse effects
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Antioxidants / therapeutic use*
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Humans
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Longitudinal Studies
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Lung Neoplasms / prevention & control*
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Male
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Randomized Controlled Trials as Topic
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Risk Factors
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Smoking / adverse effects
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Vitamin A / administration & dosage
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Vitamin A / therapeutic use
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beta Carotene / administration & dosage
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beta Carotene / adverse effects
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beta Carotene / therapeutic use*
Substances
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Antioxidants
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beta Carotene
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Vitamin A