Muthaiya, Sushila, and Babu Peter Sathyanathan. “Must-Know Guide to Complex Anal Fistulas: Supralevator, Extrasphincteric, and More”. Swiss Journal of Radiology and Nuclear Medicine 21, no. 1 (July 31, 2025): 1–11. Accessed September 27, 2026. https://sjoranm.com/sjoranm/article/view/69.