1. Department of Gastrointestinal and Hepatobiliary Surgery, University Hospital of Northern Norway, Tromsø, Norway
2. Department of Surgical Gastroenterology, Karolinska University Hospital, Stockholm, Sweden
3. Department of Digestive Surgery, Centre Hospitalier Universitaire Estaing, Clermont-Ferrand, France
4. Department of Visceral Surgery, University Hospital of Lausanne (Centre Hospitalier Universitaire Vaudois), Lausanne, Switzerland
5. Department of Digestive and Oncological Surgery, University Hospital C. Huriez, Lille, France
6. Department of Surgery, San Raffaele University, Milan, Italy
7. Department of Anesthesia, McGill University Health Centre, Montreal, Quebec, Canada
8. Northern Oesophagogastric Cancer Unit, Royal Victoria Infirmary, Newcastle Upon Tyne, UK
9. Department of Surgery, University Hospital Maastricht and NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht, The Netherlands
10. Clinical Surgery, University of Edinburgh, Royal Infirmary of Edinburgh, UK
11. Department of Surgery, Örebro University Hospital, Örebro and Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
12. Division of Gastrointestinal Surgery, Nottingham Digestive Diseases Centre National Institute for Health Research, Biomedical Research Unit, Nottingham University Hospitals, Queen's Medical Centre, Nottingham, UK
13. Department of Gastrointestinal and Hepatopancreaticobiliary Surgery, University Hospital of Northern Norway, Tromsø, Norway