1. Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine; University of Naples Federico II; Naples Italy
2. Italian Society of Ultrasound in Obstetrics and Gynecology (SIEOG); Rome Italy
3. Department of Obstetrics and Gynecology; Catholic University of Sacred Heart; Rome Italy
4. Department of Gynaecology and Obstetrics, School of Medicine; University of Udine; Udine Italy
5. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine and Reproductive Genetics, Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania USA
6. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania USA
7. Department of Maternal and Fetal Health; Fondazione Poliambulanza; Brescia Italy
8. Department of Woman's and Child's Health; University of Padua; Padua Italy
9. Feto-Maternal Medicine Unit; Parma University Hospital; Parma Italy
10. Department of Obstetrics and Gynecology; Università Roma Tor Vergata; Rome Italy
11. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine; Sidney Kimmel Medical College of Thomas Jefferson University; Philadelphia Pennsylvania USA