1. Dutch Institute for Clinical Auditing, Leiden University Medical Centre, Leiden, The Netherlands
2. Department of Surgery, Leiden University Medical Centre, Leiden, The Netherlands
3. Department of Surgery, Erasmus Medical Centre, Rotterdam, The Netherlands
4. Department of Surgery, Academic Medical Centre, Amsterdam, The Netherlands
5. Department of Pathology, VU University Medical Centre, Amsterdam, The Netherlands
6. Department of Surgical Oncology, Netherlands Cancer Institute/Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
7. Department of Surgery, University Medical Centre Utrecht, Utrecht, The Netherlands
8. Department of Surgery, Jeroen Bosch Hospital, ’s-Hertogenbosch
9. Department of Medical Oncology, Netherlands Cancer Institute/Antoni van Leeuwenhoek Hospital, Amsterdam
10. Department of Surgery, Leiden University Medical Centre, Leiden; Medical Centre Haaglanden, The Hague
11. Department of Surgery, Leiden University Medical Centre, Leiden
12. Department of Internal Medicine, St Antonius Hospital, Nieuwegein
13. Department of Public Health, Erasmus University Medical Centre, Rotterdam
14. Netherlands Comprehensive Cancer Organization, Eindhoven
15. Department of Surgery, Catharina Hospital, Eindhoven
16. Department of Surgery, University Medical Centre Groningen, Groningen
17. Department of Surgery, Radboud University Medical Centre, Nijmegen
18. Verbeeten Institute, Tilburg
19. Department of Gastroenterology and Hepatology, Radboud University Medical Centre, Nijmegen
20. Department of Surgery, IJselland Hospital, Capelle aan den IJsel
21. Netherlands Comprehensive Cancer Organization, Enschede
22. Department of Radiotherapy, Netherlands Cancer Institute/Antoni van Leeuwenhoek Hospital, Amsterdam