Er, Sadettin, Merve Akin, Huseyin Berkem, and Tezcan Akin. “Umbilical Endometriosis: A Case Report”. Annals of Medical Research 24, no. 4 (May 25, 2021): 0521–0522. Accessed July 22, 2024. http://annalsmedres.org/index.php/aomr/article/view/1558.