1. Breast Center Niederrhein and University Clinics Cologne, Moenchengladbach, Germany;
2. West German Study Group/ Breast Center Niederrhein, Moenchengladbach, Germany;
3. Charite - University Medicine Berlin, Berlin, Germany;
4. Hannover Medical School, Hannover, Germany;
5. Universitӓts-Frauenklinik Tubingen, Eberhard Karls University, Tubingen, Germany;
6. Practice network hematology/oncology, Troisdorf, Germany;
7. Rotkreuzklinikum, Munich, Germany;
8. City Hospital Cologne, Breast Center, Cologne, Germany;
9. Marienhospital Witten, Witten, Germany;
10. Gynecologic-Oncologic Practice, Hildesheim, Germany;
11. University Hospital Essen/Univeristy Hospital Leipzig, Essen, Germany;
12. St. Elisabeth Hospital Köln-Hohenlind, Cologne, Germany;
13. Charité-Universitätsmedizin Berlin, Berlin, Germany;
14. Agaplesion Diakonieklinikum Hamburg, Hamburg, Germany;
15. Kliniken Essen Mitte, Essen, Germany;
16. West German Study Group, Otterfing, Germany;
17. LMU Munich, Munich, Germany;
18. Brustzentrum der Universität München (LMU), Munich, Germany;