“ Evaluation of first-trimester PAPP-A and β-hCG levels in isolated single umbilical artery pregnancies and their association with adverse perinatal outcomes”, Ann Med Res , vol. 33, no. 3, pp. 121–127, Mar. 2026, Accessed: Mar. 30, 2026. [Online]. Available: http://www.annalsmedres.org/index.php/aomr/article/view/4919