C. Verrotti, E. Caforio, and D. Gramellini, et al., “Ultrasound screening in second and third trimester of pregnancy: an update”, Acta Biomed, vol. 78, no. 3, pp. 229–232, Dec. 2007, Accessed: Jul. 27, 2024. [Online]. Available: https://mattioli1885journals.com/index.php/actabiomedica/article/view/1908