Arwa M. Ahmed, Israa' H. Abid Al-Kareem. Maternal serum Alpha-fetoprotein Level at 12, 22 and 32weeks’ gestation in screening for pre-eclampsia. Tikrit J. Pure Sci. [Internet]. 2018 Aug. 8 [cited 2024 May 19];23(8):1-9. Available from: https://tjps.tu.edu.iq/index.php/tjps/article/view/535