1. Department of Obstetrics and Gynaecology, SS. Annunziata Hospital; G. D'Annunzio University of Chieti-Pescara; Chieti Italy
2. Fetal Medicine Unit, Division of Developmental Sciences; St George's University of London; London UK
3. Department of Obstetrics and Gynecology; Università di Roma; Rome Italy
4. Women's Health and Perinatology Research Group, Department of Clinical Medicine, Faculty of Health Sciences; UiT - The Arctic University of Norway; Tromsø Norway
5. Department of Obstetrics and Gynaecology; University Hospital of Northern Norway; Tromsø Norway