Kumar N, Das V, Agrawal A, Pandey A, Agrawal S. Association of serum placental growth factor and pregnancy associated plasma protein A between 11 to 14 weeks and pre-eclampsia. Int J Reprod Contracept Obstet Gynecol [Internet]. 2021 Apr. 23 [cited 2025 Oct. 14];10(5):1925-30. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/9998