Kumar, N., Das, V., Agrawal, A., Pandey, A., & Agrawal, S. (2021). Association of serum placental growth factor and pregnancy associated plasma protein A between 11 to 14 weeks and pre-eclampsia. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 10(5), 1925–1930. https://doi.org/10.18203/2320-1770.ijrcog20211513