Vafaei, H., K. Rafeei, M. D. Maryam Dalili, N. Asadi, N. Seirfar, and M. Akbarzadeh-Jahromi. “Prevalence of Single Umbilical Artery, Clinical Outcomes and Its Risk Factors: A Cross-Sectional Study”. International Journal of Reproductive BioMedicine (IJRM), Vol. 19, no. 5, June 2021, pp. 441–448, doi:10.18502/ijrm.v19i5.9253.