References
Klosterhalfen B, Offner F, Topf N, Vogel P, Mittermayer C. Sclerosis of the internal sphincter—a process of aging. Dis Colon Rectum 1990;33:606–9.
Haas PA, Fox TA Jr. Age-related changes and scar formations of the perianal connective tissue. Dis Colon Rectum 1980;23:160–9.
Fowler R Jr. Landmarks and legends of the anal canal. In: Stevens FD, ed. Congenital malformations of the rectum, anus, and genitourinary tract. Edinburgh: Livingston, 1963: chap 4.
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Haas, P.A. Sclerosis of the internal sphincter. Dis Colon Rectum 34, 288 (1991). https://doi.org/10.1007/BF02090174
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DOI: https://doi.org/10.1007/BF02090174