1. Radiation Oncology, UMC Utrecht, Utrecht, The Netherlands;
2. Medical Oncology, UMC Utrecht, Utrecht, The Netherlands;
3. Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands;
4. Gastro-Enterology, Meander Medical Center, Amersfoort, The Netherlands;
5. Julius Center for Health Sciences and Primary Care, UMC Utrecht, Utrecht, The Netherlands;
6. Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands;
7. Medical Oncology, Academic Medical Center, University of Amsterdam, The Netherlands;
8. Netherlands Comprehensive Cancer Organisation, Utrecht, The Netherlands;
9. Medical Oncology, St. Antonius Hospital, Nieuwegein, The Netherlands;
10. Genetics, Radboud University Medical Center, The Netherlands;
11. Gastro-Enterology and Hepatology, Erasmus University Medical Center, Rotterdam, The Netherlands;
12. Surgery, Deventer Hospital, Deventer, The Netherlands;
13. Radiology, University Medical Center Groningen, The Netherlands;
14. Medical Oncology, Tergooi Hospital, Hilversum, The Netherlands;
15. Gastro-Enterology, Radboud University Medical Center, Nijmegen, The Netherlands;
16. Trial Office Imaging Division, UMC Utrecht, Utrecht, The Netherlands