1 Division of Digestive and Transplant Surgery, Department of Surgery, University Hospital Geneva, 4 Rue Gabrielle-Perret-Gentil, 1211, Geneva, Switzerland. Electronic address: monika.hagen@hcuge.ch.
2 Division of Digestive and Transplant Surgery, Department of Surgery, University Hospital Geneva, 4 Rue Gabrielle-Perret-Gentil, 1211, Geneva, Switzerland.