1. Department of Gynaecology and Obstetrics, Medical Centre, University of Freiburg, Freiburg, Germany;
2. German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany;
3. Institute of Veterinary Medicine, Georg-August-University, Göttingen, Germany;
4. Department of Internal Medicine I, Medical Centre, University of Freiburg, Freiburg, Germany;
5. Institute for Medical Biometry and Statistics, Medical Centre, University of Freiburg, Freiburg, Germany;
6. Centre for Biological Systems Analysis (ZBSA), Albert-Ludwigs University, Freiburg, Germany;
7. Institute of Biology II, Albert-Ludwigs University, Freiburg, Germany;
8. Department of Gynaecology and Obstetrics, University Medical Centre, RWTH, Pauwelsstrasse 30, 52074 Aachen, Germany