1. Department of Obstetrics and Gynecology, Lucerne Cantonal Hospital, Lucerne, Switzerland
2. Department of Gynecology and Obstetrics, University Medicine Greifswald, German Clinical Center of Competence for Genital Sarcomas and Mixed Tumors (DKSM), Greifswald, Germany
3. Department of Gynecology and Obstetrics, Klinikum Landkreis Erding, Erding, Germany