1 Department of Pediatric and Gastrointestinal Surgery, Oslo University Hospital, Ullevål, Oslo, Norway.
2 Department of General, Visceral, Cancer and Transplantation Surgery, University of Cologne, Cologne, Germany.
3 Division of Surgery and Oncology, Department of Clinical Science, Intervention and Technology (CLINTEC), Karolinska Institutet and Department of Upper Abdominal Diseases, Karolinska University Hospital, Stockholm, Sweden.