1Department of Gastrointestinal Surgery, Amsterdam University Medical Center Location VU University Medical Center, De Boelelaan 1117, ZH 7F020, 1081 HV Amsterdam, The Netherlands
2Department of Clinical Epidemiology, Amsterdam University Medical Center, Amsterdam, The Netherlands
3Department of Gastrointestinal Surgery, San Raffaele Hospital, Milan, Italy
4Department of of Visceral-, Thoracic and Vascular Surgery, University Hospital Carl Gustav Carus, Dresden, Germany
5Department of Surgery, Universitätsmedizin Mannheim, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
6Department of Surgery, Hospital Universitario de Basurto, Bilbao, Spain
7Department of Surgery, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain
8Department of Surgery, Hospital de Jerez, Jerez de la Frontera, Spain
9Department of Surgery, Hospital Clínico San Carlos, Madrid, Spain
10Department of Surgery and Division of Foregut Surgery, IRCCS Policlinico San Donato, University of Milan, Milan, Italy
11Department of Surgery, Hospital del Sureste, Madrid, Spain
12Division of Surgery, Department of Clinical Science Intervention and Technology, Karolinska Institutet and Department of Upper Abdominal Diseases, Karolinska University Hospital, Stockholm, Sweden
13Department of Surgery, Amsterdam UMC, Location AMC, University of Amsterdam, Cancer Center Amsterdam, Amsterdam, The Netherlands
14Digestive Surgery, European Institute of Oncology - IRCCS - Milan, Milan, Italy
15Department of Surgery, Salford Royal NHS Foundation Trust, Manchester, UK
16Cancer Treatment and Quality of Life, Cancer Center Amsterdam, Amsterdam, The Netherlands