ÇAT, Hüseyin, et al. “Cyclosporin Treatment of Anal and Perianal Lesions Associated With Crohn’s Disease”. Turkish Journal of Gastroenterology, vol. 14, no. 2, Jan. 2003, pp. 121-7, https://turkjgastroenterol.org/index.php/tjg/article/view/1252.