No abstract available
MeSH terms
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Carotenoids / therapeutic use
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Head and Neck Neoplasms / drug therapy*
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Humans
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Neoplasms, Multiple Primary / prevention & control*
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Prognosis
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Retinoids / therapeutic use
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Vitamin A / adverse effects
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Vitamin A / therapeutic use*
Substances
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Retinoids
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Vitamin A
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Carotenoids