Majdfar, Z., M. Meshkat, A. Tavana, S. Tavana, Z. Amiri, F. Ehdaeevand, N. Saharkhiz, and M. Fallahian. “Comparing the Adverse Outcomes of Contraception Failure Between IUD and Withdrawal Methods”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 3, no. 3, Jan. 2017, pp. 631-5, https://www.ijrcog.org/index.php/ijrcog/article/view/1017.