Gulen, M., B. Ege, and G. T. Sarıyıldız. “Patients With Anal Fistula Due to Chronic Anal Fissure: Prevelance and Treatment”. International Surgery Journal, vol. 8, no. 9, Aug. 2021, pp. 2553-7, doi:10.18203/2349-2902.isj20213584.