Karami, Manoochehr, and Ensiyeh Jenabi. “Placenta Previa After Prior Abortion: A Meta-Analysis”. Biomedical Research and Therapy 4, no. 07 (July 28, 2017): 1441-1450. Accessed December 6, 2023. http://bmrat.org/index.php/BMRAT/article/view/197.