1. Department of Obstetrics and Gynecology, University of Perugia, Perugia, Italy;
2. Department of Obstetrics and Gynecology, Hospital Vall D’Hebron, Barcelona, Spain;
3. Mother–Infant Department, School of Midwifery, University of Modena and Reggio Emilia, Italy;
4. Department of Obstetrics and Gynaecology, General Hospital, University of Vienna, Vienna, Austria;
5. Department of Obstetrics, Saint Luc University Hospital, Université de Louvain, Brussels, Belgium;
6. Department of Obstetrics and Gynecology, Institute of Clinical Sciences, University of Gothenburg, Gothenburg, Sweden;
7. Department of Obstetrics and Gynaecology, Odense University Hospital, Odense, Denmark;
8. Department of Gynaecology and Obstetrics, University of Southern Denmark, Odense University Hospital, Odense, Denmark;
9. Division of Surgery, University College London, Northwick Park Institute of Medical Research Campus, London, UK;
10. Department of Obstetrics and Gynecology, 1st Maternity Hospital, State University of St. Petersburg, Russia;
11. Department of Obstetrics and Gynaecology, Athens University School of Medicine, Athens, Greece;
12. Department of Medicine, Peoples' Friendship University of Russia, Moscow, Russia;
13. St. Thomas Hospital, Kings College London, UK;
14. Service d'Obstétrique et de Médecine Foetale, Hôpital Necker Enfants Malades, Paris, France;
15. Department of Obstetrics and Gynecology, Medical University of Warsaw, Warsaw, Poland
16. Department of Obstetrics, University Medical Center, Utrecht, The Netherlands;