1. Breast Unit, Aarhus University Hospital/Randers Regional Hospital, Aarhus, Denmark;
2. Danish Breast Cancer Cooperative Group Secretariat, Copenhagen University, Rigshospitalet, Copenhagen, Denmark;
3. Danish Breast Cancer Cooperative Group Secretariat, Department of Oncology, Copenhagen University, Rigshospitalet, Copenhagen, Denmark;
4. Department of Breast Surgery, Copenhagen University Hospital, Herlev, Denmark;
5. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark;
6. Department of Surgery, Horsens Regional Hospital, Horsens, Denmark