1. Department of Obstetrics and Gynaecology; Arnas Civico Hospital; Palermo Italy
2. Department of Obstetrics and Gynaecology; Division of Maternal-Fetal Medicine; New York University SOM; New York NY USA
3. Centre for Medical Education and Clinical Research (CEMIC); University Hospital; Buenos Aires Argentina
4. Department of Obstetrics and Gynaecology; University of Chieti; Chieti Italy
5. Department of Maternal-Fetal medicine; Catholic University of the Sacred Heart; Rome Italy
6. Women′s Health and Perinatology Research Group; Department of Clinical Medicine; Faculty of Health Sciences; UiT-The Arctic University of Norway; Tromsø Norway
7. Department of Obstetrics and Gynecology; University Hospital of Northern Norway; Tromsø Norway