1. Department of Surgery, University Medical Center Utrecht , Utrecht , the Netherlands
2. Scientific Bureau, Dutch Institute for Clinical Auditing , Leiden , the Netherlands
3. Department of Surgery, Amsterdam UMC location University of Amsterdam , Amsterdam , the Netherlands
4. Cancer Treatment and Quality of Life, Cancer Center Amsterdam , Amsterdam , the Netherlands
5. Department of Surgery and Transplantation, Copenhagen University Hospital Rigshospitalet , Copenhagen , Denmark
6. Department of Upper Gastrointestinal Diseases, Karolinska University Hospital and Department of Clinical Science Technology and Interventions , Stockholm , Sweden
7. Nuffield Department of Surgical Sciences, University of Oxford , Oxford , UK
8. Section of Gastrointestinal Surgery, Hospital del Mar, Department of Surgery, Universitat Autònoma de Barcelona, Hospital del Mar Medical Research Institute (IMIM) , Barcelona , Spain
9. Department of Gastrointestinal Surgery, IRCCS San Raffaele Scientific Institute , Milan , Italy
10. Department of Digestive and Oncological Surgery, Claude Huriez University Hospital , Lille , France
11. Department of Thoracic Surgery, University Hospitals Leuven , Leuven , Belgium
12. Department of Surgery and Transplantation, University Hospital Zurich , Zurich , Switzerland
13. Department of General , Visceral and Transplant Surgery, , Mainz , Germany
14. University Medical Center of the Johannes Gutenberg University Mainz , Visceral and Transplant Surgery, , Mainz , Germany
15. Department of General Thoracic and Esophageal Surgery , Heart and Lung Centre, , Helsinki , Finland
16. Helsinki University Hospital , Heart and Lung Centre, , Helsinki , Finland
17. Trinity St. James’s Cancer Institute, St. James’s Hospital , Dublin , Ireland
18. Department of Gastroenterological Surgery, Oslo University Hospital , Oslo , Norway
19. Digestive Cancer Unit, Champalimaud Clinical Centre – Champalimaud Foundation , Lisbon , Portugal
20. Department of Surgery, Paracelsus Medical University Salzburg , Salzburg , Austria
21. Department of Surgery, Athens Metropolitan Hospital , Athens , Greece