1. Department of General, Visceral and Thoracic Surgery, German Armed Forces Central Hospital Koblenz , Koblenz , Germany
2. Department of Surgery, Maria Middelares Hospital, Ghent, Belgium
3. Department of General-, Visceral-, Transplant-, Vascular- and Paediatric Surgery, University Hospital of Würzburg , Würzburg , Germany
4. Department of Vascular Surgery, Rigshospitalet, University of Copenhagen , Copenhagen , Denmark
5. Faculty of Health and Medical Sciences, University of Copenhagen , Copenhagen , Denmark
6. Department of General, Visceral and Oncological Surgery , Vienna , Austria
7. Medical Faculty, Sigmund Freud University of Vienna , Vienna , Austria
8. Department of Surgery, University Hospital Schleswig-Holstein (UKSH) , Lübeck , Germany
9. Department of General and Hepatopancreatobiliary Surgery and Liver Transplantation, Ghent University Hospital , Ghent , Belgium
10. Department of General, Visceral and Thoracic Surgery, Surgical Oncology, Klinikum Saarbrücken , Saarbrücken , Germany
11. Department of General, Visceral, Thoracic and Vascular Surgery, University Hospital Bonn , Bonn , Germany
12. General, Emergency and Trauma Surgery Unit, Pisa University Hospital , Pisa , Italy
13. Department of Abdominal, Tumor, Transplant and Vascular Surgery, Cologne-Merheim Medical Centre, Witten/Herdecke University , Cologne , Germany
14. Department of General, Visceral and Vascular Surgery, German Armed Forces Hospital Hamburg , Hamburg , Germany