1. West German Study Group, Moenchengladbach, Germany
2. Geriatric Breast Center, Evangelina Bethesda Hospital for Breast Diseases, Nordrhein-Westfalen, Germany
3. Hannover Medical School, Hannover, Germany
4. Universitӓts-Frauenklinik Tübingen, Tübingen, Germany
5. Praxisnetzwerk Hämatologie / intern. Onkologie, Troisdorf, Germany
6. Rotkreuzklinikum, Munich, Germany
7. Kliniken der Stadt Köln - Krankenhaus Holweide, Cologne, Germany
8. Gyn.-onkologische Gemeinschaftspraxis Hildesheim, Hildesheim, Germany
9. University Hospital Essen, Essen, Germany
10. St. Elisabeth Hospital, Köln, Germany
11. Marien-Hospital Witten, Witten, Germany
12. Charité-Universitätsmedizin Berlin, Berlin, Germany
13. St. Antonius Hospital, Eschweiler, Germany
14. Agaplesion Diakonieklinikum Hamburg, Hamburg, Germany
15. Kliniken Essen-Mitte (KEM), Essen, Germany
16. University of Schleswig-Holstein Campus Luebeck, Luebeck, Germany
17. REK Consulting, Otterfing, Germany
18. University of Munich, Munich, Germany
19. University of Munich, Otterfing, Germany