1. Department of Obstetrics and Gynaecology, University of Chieti, Chieti, Italy;
2. Fetal medicine Unit, Division of Developmental Sciences, St. George’s University of London, London, United Kingdom;
3. Department of Obstetrics and Gynaecology, Division of Maternal-Fetal Medicine, New York, NY, USA;
4. Local Health Unit of Pescara, Pescara, Italy;
5. Department of Medical Sciences, University of Ferrara, Ferrara, Italy;
6. Department of Obstetrics and Gynaecology, Arnas Civico Hospital, Palermo, Italy;
7. Catholic University of the Sacred Heart, Rome, Italy;
8. Women´s Health and Perinatology Research Group, Department of Clinical Medicine, Faculty of Health Sciences, UiT-The Arctic University of Norway, Tromsø, Norway;
9. Department of Obstetrics and Gynaecology, University Hospital of Northern Norway, Tromsø, Norway