1. Department of Psychosocial Research and Epidemiology, The Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
2. Centre Hospitalier Universitaire Brugmann, Brussels, Belgium
3. Institute of Biostatistics and Registry Research, Brandenburg Medical School Theodor Fontane, Neuruppin, Germany
4. Department of Medical Oncology, Radboud University Medical Centre, Nijmegen, The Netherlands
5. Amsterdam University Medical Centre, Amsterdam, The Netherlands
6. Department of Medical Oncology, University Medical Centre Groningen, Groningen, The Netherlands
7. Isala Oncology Center, Zwolle, The Netherlands
8. Department of Medical Oncology, Maastricht University Medical Centre, Maastricht, The Netherlands
9. Leiden University Medical Centre, Leiden,The Netherlands
10. Department of Internal Medicine, Amphia Hospital, Breda, The Netherlands
11. Medical Spectrum Twente, Enschede,The Netherlands
12. Department of Internal Medicine, Maxima Medical Centre, Eindhoven,The Netherlands
13. Erasmus University Medical Centre, Rotterdam, The Netherlands
14. Department of Medical Oncology, University Medical Cancer Center, Utrecht, The Netherlands
15. Universitair Ziekenhuis Brussel, Brussel, Belgium
16. Bristol-Myers Squibb, Utrecht, The Netherlands