No abstract available
MeSH terms
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Aged
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DNA, Viral / analysis*
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Esophageal Neoplasms / virology*
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Humans
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Male
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Papillomaviridae / isolation & purification*
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Papillomavirus Infections / diagnosis*
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Polymerase Chain Reaction
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Precancerous Conditions / virology*
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Tumor Virus Infections / diagnosis*