Kumari, S., Roychowdhury, J. and 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 (Feb. 2017), 2135–2140. DOI:https://doi.org/10.18203/2320-1770.ijrcog20161897.