1. Danish Breast Cancer Cooperative Group (DBCG) Secretariat and Statistical Office, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark;
2. Department of Oncology, Copenhagen University Rigshospitalet, Copenhagen, Denmark;
3. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark;
4. Department of Experimental Clinical Oncology, Aarhus University Hospital, Aarhus, Denmark;
5. Department of Breast Surgery, Aarhus University Hospital, Aarhus, Denmark;
6. Department of Breast Surgery, Copenhagen University Rigshospitalet, Copenhagen, Denmark