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Tricomi, N., Velci, L. & Podzemny, V. Ring-shaped fibroepithelial polyps of the anus. Tech Coloproctol 23, 281–282 (2019). https://doi.org/10.1007/s10151-019-01946-7
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DOI: https://doi.org/10.1007/s10151-019-01946-7