1. Department of Radiation Oncology, Institut Gustave Roussy, Villejuif, France;
2. Department of Radiation Oncology, Erasmus MC, Rotterdam, The Netherlands;
3. Biostatistics and Epidemiology Unit, Institut Gustave Roussy, Villejuif, France;
4. Department of Surgery, Surgical Oncology Unit, Institut Gustave Roussy, Villejuif, France;
5. Departments of Cancer Medicine and Breast Oncology, Institut Gustave Roussy, Villejuif, France;
6. Pathology Department, Institut Gustave Roussy, Villejuif, France;
7. Oncology Pathology Department, Karolinska Institutet, Stockholm, Sweden