1. Department of Maternal-Fetal Medicine; Catholic University of the Sacred Heart; Rome Italy
2. Centre for Medical Education and Clinical Research (CEMIC); University Hospital; Buenos Aires Argentina
3. Department of Radiology; Abington Memorial Hospital; PA USA
4. Department of Obstetrics and Gynaecology; Arnas Civico Hospital; Palermo Italy
5. Department of Obstetrics and Gynaecology, Division of Maternal-Fetal Medicine; New York University SOM; New York NY USA