1. Nuffield Department of Surgery, University of Oxford, UK
2. Department of Upper Gastrointestinal Surgery, University Medical Center Utrecht, The Netherlands
3. Scientific Bureau, Dutch Institute for Clinical Auditing, Leiden, The Netherlands
4. Department of Surgery, Catharina Hospital, Eindhoven, The Netherlands
5. Department of Surgery, Zuyderland Medical Center, Heerlen and Sittard-Geleen, The Netherlands
6. Department of Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands
7. Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
8. Department of Surgery, ZGT Hospitals, Almelo, The Netherlands
9. Department of Surgery, Gelre Hospitals, Apeldoorn, The Netherlands
10. Department of Surgery, Meander Medical Center, Amersfoort, The Netherlands
11. Department of Surgery, Amsterdam UMC location University of Amsterdam, Amsterdam, The Netherlands
12. Cancer Treatment and Quality of Life, Cancer Center Amsterdam, Amsterdam, The Netherlands
13. Department of Surgery, Amsterdam UMC location Vrije Universiteit, Amsterdam, The Netherlands