1. Department of Gynecology and Obstetrics, University Hospital Essen, Essen, Germany
2. German Cancer Consortium (DKTK), Dresden and German Cancer Research Center (DKFZ), Heidelberg, Germany
3. Department of Gynecology and Obstetrics, Medical Faculty and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
4. National Center for Tumor Diseases (NCT), Partner Site Dresden, Dresden, Germany
5. ACOMED Statistik, Department of Biostatics, Magdeburg, Germany
6. QIAGEN Hannover GmbH, Langenhagen, Germany