Antsaklis A, Paulescu D, Tudorache S, Ceausu I, Novac L, Cernea N, Iliescu D, Cara M. Challenges in Sonographic Detection of Fetal Major Structural Abnormalities at the First Trimester Anomaly Scan. Donald School J Ultrasound Obstet Gynecol 2015; 9 (3):239-259.