1. Moenchengladabach, West German Study Group
2. Moenchengladbach, Breast Center Niederrhein, Evangelical Hospital Johanniter Bethesda
3. University Clinics Cologne
4. Department of Gynecology and Obstetrics, University Clinics Schleswig-Holstein/Campus Luebeck
5. Institute of Pathology, Medical School Hannover
6. Department of Gynecology and Obstetrics, University Clinics Tuebingen
7. Oncology Practice Network Troisdorf
8. Breast Center, Rotkreuz Clinics Munich
9. Breast Center, City Hospital of Cologne Holweide
10. Breast Center, Marien-Hospital Witten
11. Gynecologic Oncologic Practice Hildesheim
12. Department of Gynecology and Obstetrics, University Clinics Essen
13. Department of Gynecology, University Hospital Leipzig
14. Breast Center, St. Elisabeth Hospital Cologne
15. Clinic of Gynecology, Charité University Clinics Berlin
16. Department of Gynecology and Obstetrics, Agaplesion Diakonie Clinic
17. Clinics Essen-Mitte, Breast Center
18. Department of Oncology, Clinics Mutterhaus Trier
19. Department of Oncology, Evangelical Waldkrankenhaus Berlin
20. Department of Oncology, St. Antonius Hospital
21. Department of Gynecology and Obstetrics, Evangelical Hospital Ludwigsfelde
22. Statitistics, Palleos Healthcare
23. Breast Center, University of Munich (LMU) and CCCLMU, Munich, Germany