1. Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Aarhus, Denmark
2. Danish Cancer Society Research Center, Copenhagen, Denmark
3. Department of Plastic and Breast Surgery, Aarhus University Hospital, Aarhus, Denmark
4. Danish Breast Cancer Group, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
5. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA