1. Department of Obstetrics, Jena University Hospital, Jena, Germany
2. Clinic for Gynecology and Obstetrics, Heinrich-Heine-University, Düsseldorf, Germany
3. Department of Obstetrics and Gynecology, University Hospital of Schleswig-Holstein, Kiel University, Kiel, Germany
4. Department of Obstetrics and Gynecology, St. Joseph-Hospital, Berlin, Germany
5. Hospital for Children and Adolescents, University Hospital of Frankfurt, Frankfurt, Germany
6. Department of Obstetrics and Gynecology, Sana Hospital Lichtenberg, Berlin, Germany
7. Department of Obstetrics and Gynecology, Darmstadt City Hospital, Darmstadt, Germany
8. Department of Gynecology and Obstetrics, Protestant Hospital of Bethel Foundation, Bielefeld, Germany
9. University Department of Obstetrics and Gynecology, The Hospital St. Hedwig of The Order of St. John, University of Regensburg, Regensburg, Germany
10. Department of Obstetrics and Gynecology, University Hospital, Essen, Germany
11. Department of Obstetrics and Gynecology, St. Elisabeth’ Hospital, Loerrach, Germany
12. Department of Obstetrics and Gynecology, Munich Municipal Hospital, Harlaching, Munich, Germany
13. Department of Gynecology and Obstetrics, TU Dresden, Dresden, Germany
14. Department for Obstetrics and Gynecology, University Hospital, Ludwig-Maximilians-University Munich, Munich, Germany
15. Department of Gynecology and Obstetrics, University Hospital Würzburg, Würzburg, Germany
16. Clinic for Pediatrics and Adolescent Medicine I / Neonatology, University Hospital Schleswig-Holstein, Kiel University, Kiel, Germany