1. Department of Radiotherapy, The Netherlands Cancer Institute, Amsterdam, The Netherlands;
2. Department of Epidemiology, The Netherlands Cancer Institute, Amsterdam, The Netherlands;
3. Department of Hematology, the Dr Daniel den Hoed Cancer Center, Rotterdam, The Netherlands;
4. Department of Radiotherapy, the Dr Daniel den Hoed Cancer Center, Rotterdam, The Netherlands;
5. Department of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands