Charalampopoulos, A. et al. 2022. Anal Fistula of Crypto-Glandular Etiology: A Review of the Literature with a Step-by-Step Approach for Diagnosis and Surgical Management. International Journal of Innovative Research in Medical Science. 7, 10 (Oct. 2022), 515–521. DOI:https://doi.org/10.23958/ijirms/vol07-i10/1508.