Kenche J, Reddy C. Efficacy of chemical sphincterotomy with 2% diltiazem cream vs. surgical sphincterotomy in the management of chronic fissure in ano: a clinical study. Int Surg J [Internet]. 2018 Nov. 28 [cited 2025 Apr. 29];5(12):4047-51. Available from: https://www.ijsurgery.com/index.php/isj/article/view/3679