A Prospective Study On Closed Lateral Internal Sphincterotomy In Chronic Anal Fissures: Original Article. Journal of Bacha Khan Medical College, [S. l.], v. 2, n. 1, p. 1–4, 2021. DOI: 10.69830/jbkmc.v2i01.44. Disponível em: https://jbkmc.bkmc.edu.pk/index.php/website/article/view/44. Acesso em: 13 may. 2026.