1. Department of Obstetrics and Gynecology; Catholic University of The Sacred Heart; Fondazione Policlinico A. Gemelli; Rome Italy
2. Department of Obstetrics and Gynecology; University of Chieti; Chieti Italy
3. Department of Radiology; Abington Hospital; Abington PA USA
4. Department of Obstetrics and Gynecology; Fondazione Poliambulanza; Brescia Italy
5. Department of Obstetrics and Gynecology; Arnas Civico Hospital; Palermo Italy
6. Department of Medical Sciences; University of Ferrara; Ferrara Italy
7. Local Health Unit of Pescara; Pescara Italy
8. Department of Obstetrics and Gynecology; University Hospital of Northern Norway; Tromsø Norway
9. Women′s Health and Perinatology Research Group; Department of Clinical Medicine; Faculty of Health Sciences; UiT-The Arctic University of Norway; Tromsø Norway