Ade-Ojo, Idowu Pius, and Oluwadare Martins Ipinnimo. “Menstruating Primary Umbilicus Cutaneous Endometriosis: A Case Report and Review of Literature”. Clinical Journal of Obstetrics and Gynecology 4, no. 2 (May 5, 2021): 069–071. Accessed December 3, 2025. https://www.obstetricgynecoljournal.com/index.php/cjog/article/view/cjog-aid1090.