Osman Riaz; Noreen Kousar; Muhammad Sabir; Ghulam Murtaza; Muhammad Ahsan; Naveed Akhtar. Comparative Study of Lateral Internal Sphinterotomy Versus Anal Advancement Flap in the Treatment of Chronic Anal Fissure: A Randomized Controlled Trial. IJPRT 2026, 16, 3780-3786.