1. German Breast Group/University Frankfurt, Neu-Isenburg, Frankfurt, Germany
2. University of Cologne, Cologne, Germany
3. Department of Obstetrics and Gynecology, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Comprehensive Cancer Center Erlangen-EMN, Erlangen, Germany
4. University Hospital Heidelberg, Heidelberg, Germany
5. Hematology Oncology Clinic, Munich, Germany
6. Breast Center Duesseldorf, Louisen Hospital, Düsseldorf, Germany
7. Brustzentrum Sankt-Gertrauden-Krankenhaus, Berlin, Germany
8. Frauenklinik Gera, Gera, Germany
9. Sana Kliniken Offenbach, Offenbach, Germany
10. University Rostock, Rostock, Germany
11. Praxisklinik Krebsheilkunde, Berlin, Germany
12. Breast Cancer Centre, Kliniken Essen-Mitte, Evangelische Huyssens-Stiftung, Essen, Germany
13. University Kiel, Kiel, Germany
14. Department of Obstetrics and Gynecology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
15. German Breast Group, Neu-Isenburg, Germany
16. German Breast Group/Sana Klinikum Offenbach, Neu-Isenburg, Germany
17. Department of Gynecology and Obstetrics and Multidisciplinary Breast Cancer Center, Helios Klinikum Berlin-Buch, Berlin, Germany
18. Center for Familial Breast and Ovarian Cancer and Center of Integrated Oncology, Cologne, Germany