Hasabe, R. A., Tripathi, N. S. and Kesarkodi, P. (2022) “Menstruating umbilicus: secondary subcutaneous umbilical endometriosis: a rare case report”, International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 11(6), pp. 1814–1817. doi: 10.18203/2320-1770.ijrcog20221469.