1. Department of Gynaecology, Martin Luther University Halle-Wittenberg, D-06120 Halle (Saale), Germany
2. Global Health Working Group, Institute of Medical Epidemiology, Biometrics and Informatics, Martin Luther University Halle-Wittenberg, D-06097 Halle (Saale), Germany
3. Institute for Clinical Epidemiology and Applied Biometry, D-72076 Tuebingen, Germany
4. Robert Bosch Society for Medical Research, D-70376 Stuttgart, Germany
5. Department of Gynaecology, Johannes-Gutenberg University, D-55131 Mainz, Germany
6. Department of Medical Oncology, Medical Faculty, F-13344 Marseille, France
7. Department of Medical Oncology, Henri Becquerel Center, F-76038 Rouen, France
8. Department of Gynaecology, Klinikum Deggendorf, D-94469 Deggendorf, Germany
9. Department of Gynaecology, Nathanstift, Hospital Fürth, D-90766 Fürth, Germany
10. Department of Gynaecology, Technische Universitaet Muenchen, D-81675 Munich, Germany
11. Department of Gynaecology, St. Vincenz Hospital, D-33098 Paderborn, Germany
12. Department of Gynecology, St. Josephs-Hospital, D-65189 Wiesbaden, Germany
13. Department of Gynaecology, Katholisches Klinikum, D-55131 Mainz, Germany
14. Department of Laboratory Medicine, Radboud University Medical Center, NL-6500 HB Nijmegen, The Netherlands
15. Department of Gynaecology, University Medical Center Hamburg-Eppendorf, D-20251 Hamburg, Germany
16. German Breast Group Forschungs-GmbH, D-63263 Neu-Isenburg, Germany
17. Breast Center, Ludwig-Maximilian University Hospital, D-81377 Munich, Germany