Kant, R.H., Ara, S., Lone, A.I. and Gupta, S. 2017. Evaluation of outcome of pregnancy in threatened abortion by serum progesterone levels. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 4, 5 (Feb. 2017), 1313–1318. DOI:https://doi.org/10.18203/2320-1770.ijrcog20150702.