1. University of Mainz, Mainz, Germany;
2. AGO and Charité Campus Virchow-Klinikum, Berlin, Germany;
3. AGO and Kaiserswerther Diakonie, Duesseldorf, Germany;
4. AGO and Coordinating Center for Clinical Trials, Marburg, Germany;
5. Department of Gynecology and Obstetrics, Klinikum rechts der Isar, Muenchen, Germany, Muenchen, Germany;
6. Ernst Moritz Arndt Universität Greifswald - Klinik und Poliklinik für Frauenheilkunde und Geburtshilfe, Greifswald, Germany;
7. Universtiy Medical Center Freiburg, Freiburg, DE;
8. Ludwig-Maximilians-Universität München and University Medical Center Hamburg-Eppendorf, Germany, Munich, Germany;
9. Hannover Medical School, Department of Obstetrics and Gynecology, Breast Center, Hannover, Germany;
10. Klinikum Wolfsburg, Wolfsburg, Germany;
11. AGO Study Group & Kliniken Essen Mitte, Essen, Germany;
12. Albertinen-Krankenhaus, Hamburg, Germany;
13. Onkologisches Therapiezentrum am Krankenhaus Jerusalem, Hamburg, Germany;
14. Oberschwabenklinik, Ravensburg, Germany;
15. Department of Gynecology, Fuerth Hospital, Fuerth, Germany;
16. University of Ulm, Ulm, Germany;
17. Department of Obstetrics and Gynecology, Medical University of Graz, Graz, Austria;
18. AGO and Philipps University Marburg, Marburg, Germany;
19. AGO and Kliniken Essen Mitte, Essen, Germany;