1. Department of Obstetrics and Gynecology; Fondazione Poliambulanza; Brescia Italy
2. Department of Obstetrics and Gynecology; Arnas Civico Hospital; Palermo Italy
3. Department of Clinical Science, Intervention and Technology; Karolinska Institute; Stockholm Sweden
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 Gynecology; Division of Maternal-Fetal Medicine; New York University SOM; New York NY USA
6. Center for Medical Education and Clinical Research (CEMIC); University Hospital; Buenos Aires Argentina
7. Department of Obstetrics and Gynecology; Catholic University of The Sacred Heart; Rome Italy
8. Department of Obstetrics and Gynecology; University of Chieti; Chieti Italy
9. Department of Medical Sciences; University of Ferrara; Ferrara Italy
10. Local Health Unit of Pescara; Pescara Italy
11. Department of Obstetrics and Gynecology; University Hospital of Northern Norway; Tromsø Norway