Heidelberg University - Department of General, Visceral and Transplantation Surgery, Heidelberg University, Heidelberg University, Heidelberg University, Heidelberg University, Heidelberg University, Heidelberg University, University Hospital Würzburg - Department of General, Visceral, Transplant, Vascular and Pediatric Surgery, University Hospital Würzburg, University of Verona - Department of General and Pancreatic Surgery, University of Verona, Katharinenhospital, Katharinenhospital, University of Freiburg - Medical Center, University of Freiburg - Medical Center, Schleswig-Holstein University, Schleswig-Holstein University, Justus Liebig University Giessen, Justus Liebig University Giessen, General Public Hospital of the Brothers of St. John of God, General Public Hospital of the Brothers of St. John of God, University of Ljubljana - University Medical Centre Ljubljana, University of Ljubljana - University Medical Centre Ljubljana, Heidelberg University, Heidelberg University - Department of General, Visceral and Transplantation Surgery, Heidelberg University, Heidelberg University - Department of General, Visceral and Transplantation Surgery and Heidelberg University - Department of General, Visceral and Transplantation Surgery