1. Department of Gynecology and Obstetrics, University Hospital Essen, Essen, Germany.
2. Department of Gynecologic Oncology, Gdynia Oncology Center, Pomeranian Hospitals, Gdynia, Poland.
3. Department of Gynecology and Obstetrics, Klinikum Gütersloh, Gütersloh, Germany.
4. Department of Gynecology, University Hospital Zürich, Zürich, Switzerland.
5. Department of Gynecology and Obstetrics, Klinikum Kassel, Kassel, Germany.
6. Department of Gynecology and Obstetrics, University Hospital of Dresden, Technische Universität Dresden, Dresden, Germany.