1 Department of General, Visceral and Transplantation Surgery, University Hospital of Tübingen, Tübingen, Germany.
2 Department of General, Visceral, Thoracic, Transplantation and Pediatric Surgery, University Hospital Schleswig Holstein, Campus Kiel, Kiel, Germany.
3 Clinic of General and Visceral Surgery, Hospital Neuwerk 'Maria von den Aposteln', Mönchengladbach, Germany.
4 Department of Visceral, Thorax and Vascular Surgery, Carl Gustav Carus University Hospital Dresden, Dresden, Germany.
5 Department of General and Visceral Surgery, HELIOS Hospital Erfurt, Erfurt, Germany.
6 Surgical Working Group of Young Surgeons (CAJC; chair and co-chair) of the DGAV (German Society for General and Visceral Surgery), Berlin, Germany.
7 Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany.
8 Department of General Surgery, University Hospital Oulu, Oulu, Finland.
9 Department of General, Visceral and Transplantation Surgery, University Hospital RWTH Aachen, Aachen, Germany.