Kharb, S., R. Tiwari, and S. Nanda. “Relationship Between Gestational Age and Endoglin Levels in Maternal and Cord Blood”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 3, Feb. 2017, pp. 770-4, doi:10.18203/2320-1770.ijrcog20160582.