1. Department of Surgery, Clarunis – University Centre for Gastrointestinal and Liver Diseases, Basel, Switzerland
2. Swiss HPB and Transplantation Center, Department of Surgery and Transplantation, University Hospital Zurich, Zurich, Switzerland
3. Department for General, Visceral and Vascular Surgery, Kantonsspital Baden, Baden, Switzerland
4. Department of General, Visceral and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
5. Department of General, Visceral and Thoracic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany