No abstract available
MeSH terms
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Anal Canal / pathology
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Anal Canal / surgery
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Anus Neoplasms / diagnosis*
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Biopsy / methods*
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Carcinoma in Situ / diagnosis*
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Carcinoma, Squamous Cell / diagnosis*
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Early Detection of Cancer / methods*
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Endoscopy, Gastrointestinal / methods*
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Humans