Sritharan, H., Ashok Kumar, N.K. and Syed Ibrahim M. S., M.I. 2020. Single centre randomized comparative trial of lateral internal sphincterotomy versus 2% diltiazem in chronic anal fissure. International Surgery Journal. 7, 6 (May 2020), 1723–1727. DOI:https://doi.org/10.18203/2349-2902.isj20202089.