1. Lee WS, Chun HK, Lee WY, Yun SH, Yun H, Cho YB, et al. Anal canal carcinoma: experience from a single Korean institution. Yonsei Med J. 2007;48:827–32.
2. Wong MT, Lim JF, Eu KW. Anal canal malignancies: a review in an Asian population. Singapore Med J. 2011;52:9–14.
3. Fenger C. The anal transitional zone. Acta Pathol Microbiol Immunol Scand Suppl. 1987;289:1–42.
4. Inomata M, Kotake K, Ajioka Y, Kawai K, Ueno H, Goi T, et al editors. Japanese classification of colorectal, appendiceal, and anal carcinoma. 3rd ed. Tokyo.: Kanehara; 2019. p. 8 (English edition).
5. Jin F, Stein AN, Conway EL, Regan DG, Law M, Brotherton JM, et al. Trends in anal cancer in Australia, 1982–2005. Vaccine. 2011;29:2322–7.