1. Department of Gynecology and Obstetrics, University Medical Center Regensburg, Landshuter Straße 65, 93053 Regensburg, Germany
2. Center for Clinical Studies, University Hospital Regensburg, 93053 Regensburg, Germany
3. Institute of Pathology, University of Regensburg, 93053 Regensburg, Germany
4. Tumor Center Regensburg e.V., University of Regensburg, 93053 Regensburg, Germany