No abstract available
MeSH terms
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Animals
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Anticarcinogenic Agents / therapeutic use*
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Clinical Trials as Topic
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Esophageal Neoplasms / prevention & control*
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Head and Neck Neoplasms / prevention & control*
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Humans
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Lung Neoplasms / prevention & control*
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Neoplasms, Second Primary / prevention & control
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Retinoids / therapeutic use
Substances
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Anticarcinogenic Agents
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Retinoids