1. Department of Medical Oncology, Zuyderland Medical Centre, Geleen, The Netherlands;
2. Department of Medical Oncology, GROW – School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands;
3. Department of Biometrics, Netherlands Cancer Institute, Amsterdam, The Netherlands;
4. Department of Trial Registration, Comprehensive Cancer Centre the Netherlands, Rotterdam, The Netherlands;
5. Dutch Breast Cancer Research Group, BOOG study Centre, Amsterdam, The Netherlands;
6. Department of Medical Oncology, Isala Clinic, Zwolle, The Netherlands;
7. Department of Medical Oncology, Leeuwarden Medical Centre, Leeuwarden, The Netherlands;
8. Department of Medical Oncology, Erasmus Medical Centre, Rotterdam, The Netherlands