1. Department of Obstetrics and Gynaecology, SS. Annunziata Hospital; G. D'Annunzio University of Chieti-Pescara, Chieti; Italy
2. Department of Obstetrics and Gynaecology, Fondazione Poliambulanza; Brescia Italy
3. Department of Maternal-Fetal Medicine; Catholic University of the Sacred Heart; Rome Italy
4. Department of Medical Sciences; University of Ferrara; Ferrara Italy
5. Department of Obstetrics and Gynaecology; University of Rome Tor Vergata; Rome Italy
6. Department of Clinical Medicine, Faculty of Health Sciences, UiT, The Arctic University of Norway, and Department of Obstetrics and Gynaecology; University Hospital of Northern Norway; Tromsø Norway