1. Department of Oncology, Rigshospitalet, Copenhagen, Denmark;
2. Department of Surgical Pathology, Zealand University Hospital, Slagelse, Denmark;
3. Department of Pathology, Herlev Hospital, Herlev, Denmark;
4. Department of Breast Surgery, Sygehus Soenderjylland, Aabenraa, Denmark;
5. Department of Breast Surgery, Ringsted Sygehus, Ringsted, Denmark;
6. Department of Breast Surgery, Rigshospitalet, Copenhagen, Denmark;
7. Breast Unit, Aarhus University Hospital/Randers Regional Hospital, Aarhus, Denmark;
8. Danish Breast Cancer Cooperative Group Secretariat, Rigshospitalet, Copenhagen, Denmark