Sudoł-Szopinska, Iwona, Wiesław Jakubowski, Malgorzata Kolodziejczak, Tomasz Szopinski, and Anna K. Panorska. “Endosonography in the Diagnosis of Recurrent Anal Fistulas”. Radiology and Oncology 39, no. 3 (September 1, 2005). Accessed May 1, 2024. https://www.radioloncol.com/index.php/ro/article/view/1286.