1 Department of Surgery and Clinical and Experimental Medicine, Linköping University, Linköping, Sweden Department of Hepato-Pancreato-Biliary Surgery, Oslo University Hospital, Oslo, Norway Department of Clinical Science, Intervention and Technology, Division of Surgery, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden Department of Surgical Gastroenterology and Transplantation, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark Department of Surgery and Clinical and Experimental Medicine, Linköping University, Linköping, Sweden Department of Surgery, Lund University, Skane University Hospital, Lund, Sweden Department of Surgical Gastroenterology and Transplantation, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark Department of Hepato-Pancreato-Biliary Surgery, Oslo University Hospital, Oslo, Norway Department of Surgery, Akademiska Hospital, University of Uppsala, Uppsala, Sweden Department of Surgery and Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.