1. Department of Gynecology and Obstetrics, Klinikum Magdeburg, Magdeburg, Germany
2. Department of Gynecology and Obstetrics, Helios Klinik, Schwelm, Germany
3. Gynecologic Oncology Unit, Metropolitan Hospital, Athens, Greece
4. Department of Gynecology and Obstetrics, Klinikum St. Marien, Amberg, Germany
5. Institute of Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany