1. University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
2. Department of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
3. AGO, Sana Klinikum Offenbach, Offenbach, Germany;
4. Coordinating Center for Clinical Trials, Marburg, Germany;
5. Klinik am Eichert, Göppingen, Germany;
6. Kreisklinik Altötting, Altötting, Germany;
7. Department of Obstetrics and Gynecology, Center for Integrated Oncology, University Hospital Cologne, Cologne, Germany;
8. Oberhavel Klinikum, Klinik Oranienburg, Oranienburg, Germany;
9. Gynecologic Oncology Center, Kiel, Germany;
10. Elblandklinikum Radebeul, Radebeul, Germany;
11. Frauenklinik Innenstadt Munich University, Muenchen, Germany;
12. Onkologisches Therapiezentrum am Krankenhaus Jerusalem, Hamburg, Germany;
13. Department of Obstrics and Gynecology, Universtity of Ulm, Ulm, Germany;
14. Universitaetsklinikum Freiburg, Freiburg, Germany;
15. Charité Campus Virchow-Klinikum, Berlin, Germany;
16. Universitatsklinikum Magdeburg, Magdeburg, Germany;
17. Hannover Medical School, Hannover, Germany;
18. Universitatsfrauenklinik Muenchen - Grosshadern, Munchen, Germany;
19. Universitatsklinikum Halle, Halle, Germany;
20. Department for Gynecology, University of Munich, Munich, Germany;