1. Department of Surgery, Erasmus MC, Erasmus University, Rotterdam, the Netherlands
2. Department of Surgery, Cancer Centre Amsterdam, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
3. Dutch Institute for Clinical Auditing, Scientific Bureau, Leiden, the Netherlands
4. Department of Surgery, University Medical Centre Groningen, Groningen, the Netherlands
5. Department of Surgery, Albert Schweitzer Hospital, Dordrecht, the Netherlands
6. Department of Surgery, Radboud University Medical Centre, Nijmegen, the Netherlands
7. Department of Surgery, Jeroen Bosch Hospital, ‘s- Hertogenbosch, the Netherlands
8. Department of Surgery, Meander Medical Centre, Amersfoort, the Netherlands
9. Department of Surgery, Maastricht University Medical Centre, Maastricht, the Netherlands
10. Department of Surgery, Amphia Hospital, Breda, the Netherlands
11. Department of Surgery, University Medical Centre Utrecht, Utrecht, the Netherlands
12. Department of Surgery, Gelderse Vallei Hospital, Ede, the Netherlands
13. Department of Surgery, Netherlands Cancer Institute, Amsterdam, the Netherlands
14. Department of Surgery, Máxima Medisch Centrum, Veldhoven, the Netherlands
15. Department of Surgery, Medical Spectrum Twente, Enschede, the Netherlands
16. Department of Surgery, Medical Centre Leeuwardena, Leeuwarden, the Netherlands
17. Department of Surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, the Netherlands
18. Department of Surgery, Leiden University Medical Centre, Leiden, the Netherlands
19. Department of Surgery, Spaarne Gasthuis, Haarlem, the Netherlands
20. Department of Surgery, Isala Hospital, Zwollea, the Netherlands
21. Department of Surgery, Sint Antonius Hospital, Nieuwegein, the Netherlands
22. Department of Surgery, Deventer Hospital, Deventer, the Netherlands
23. Department of Surgery, Gelre Hospital Apeldoorn, Apeldoorn, the Netherlands
24. Department of Surgery, IJsselland Hospital, Capelle aan den Ijssel, the Netherlands