1. Department of Gynecology & Gynecologic Oncology, Kliniken Essen Mitte (KEM), Evang. Huyssens-Stiftung/Knappschaft GmbH, Henricistr. 92, 45136 Essen, Germany
2. Department of Gynecology & Gynecologic Oncology, Kliniken Essen-Mitte, Essen Germany
3. Department of Gynecology, Charité Medical University of Berlin, Berlin, Germany