1. Department of Perinatology; University Medical Center; Utrecht The Netherlands
2. Department of Obstetrics and Gynaecology; University Medical Center, University of Groningen; Groningen The Netherlands
3. Department of Woman, Mother and Neonate, Buzzi Children's Hospital; University of Milan; Milan Italy
4. Maternal-Fetal Medicine Unit; University of Brescia; Brescia Italy
5. Department of Obstetrics and Gynecology; University Hospital; Parma Italy
6. Department of Obstetrics and Gynecology; Academic Medical Centre; Amsterdam The Netherlands
7. Department of Surgery and Cancer; Imperial College London; London UK
8. Department of Development and Regeneration; KU Leuven; Leuven Belgium
9. Department of Gynecology and Obstetrics; University Federico II of Naples; Naples Italy
10. Department of Obstetrics and Gynecology; Sant' Anna Hospital; Turin Italy
11. Department of Obstetrics and Fetal Medicine; University Medical Center Hamburg-Eppendorf; Hamburg Germany