Abbasi Aval, N., S. Aslanabadi, M. Kharaziha, S. Zarrintan, and F. Ilkhchooyi. “Anal Sphincter: A Comprehensive Review”. Iranian Journal of Pediatric Surgery, vol. 3, no. 1, Oct. 2017, pp. 1-8, doi:10.22037/irjps.v3i1.17120.