Kumari, S., Roychowdhury, J., & Biswas, S. (2017). Prediction of early pregnancy failure by use of first trimester ultrasound screening. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 5(7), 2135–2140. https://doi.org/10.18203/2320-1770.ijrcog20161897