“ Evaluation of First-Trimester PAPP-A and β-HCG Levels in Isolated Single Umbilical Artery Pregnancies and Their Association With Adverse Perinatal Outcomes”. Annals of Medical Research 33, no. 3 (March 25, 2026): 121–127. Accessed March 30, 2026. http://www.annalsmedres.org/index.php/aomr/article/view/4919.