1. Department of Obstetrics and Gynecology; University of Chieti; Chieti Italy
2. Local Health Unit of Pescara; Pescara Italy
3. Department of Medical Sciences; University of Ferrara; Ferrara Italy
4. Department of Obstetrics and Gynecology; Catholic University of the Sacred Heart; Rome Italy
5. Women's Health and Perinatology Research Group, Department of Clinical Medicine, Faculty of Health Sciences; UiT - The Arctic University of Norway; Tromsø Norway
6. Department of Obstetrics and Gynecology; University Hospital of Northern Norway; Tromsø Norway