1. University Medical Center Utrecht, Department of Medical Oncology, Utrecht, the Netherlands
2. Franciscus Gasthuis, Department of Medical Oncology, Rotterdam, the Netherlands
3. Erasmus MC Cancer Institute, Department of Medical Oncology, Rotterdam, the Netherlands
4. Amphia Hospital, Department of Medical Oncology, Breda, the Netherlands
5. Maxima Medical Center, Department of Medical Oncology, Eindhoven, the Netherlands
6. St Antonius Hospital, Department of Medical Oncology, Nieuwegein, the Netherlands
7. Medical Center Leeuwarden, Department of Medical Oncology, Leeuwarden, the Netherlands
8. Zuyderland Medical Center, Department of Medical Oncology, Heerlen, the Netherlands
9. Maastricht University Medical Center, Department of Medical Oncology, Maastricht, the Netherlands
10. Elisabeth Tweesteden Hospital, Department of Medical Oncology, Tilburg, the Netherlands
11. University Medical Center Utrecht, Department of Medical Oncology, Utrecht, the Netherlands3Erasmus MC Cancer Institute, Department of Medical Oncology, Rotterdam, the Netherlands
12. Isala Clinics, Department of Medical Oncology, Zwolle, the Netherlands
13. Haga Hospital, Department of Medical Oncology, Den Haag, the Netherlands
14. Zuyderland Medical Center, Department of Medical Oncology, Sittard-Geleen, the Netherlands
15. Academic Medical Center, Department of Medical Oncology, Amsterdam, the Netherlands
16. Netherlands Cancer Institute, Department of Biometrics, Amsterdam, the Netherlands
17. Netherlands Cancer Institute, Department of Medical Oncology, Amsterdam, the Netherlands
18. University Medical Center Utrecht, Department of Medical Oncology, Utrecht, the Netherlands16Netherlands Cancer Institute, Department of Medical Oncology, Amsterdam, the Netherlands