Okeke, T. C., Agwuna, K. K., Ezenyeaku, C. C., & Ikeako, L. C. (2017). Application of ultrasonography in female infertility: a comprehensive review. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 4(5), 1246–1256. https://doi.org/10.18203/2320-1770.ijrcog20150693