1. The Intervention Centre, Oslo University Hospital, Oslo, Norway
2. Department of Hepato-Pancreato-Biliary Surgery, Oslo University Hospital, Oslo, Norway
3. Institute of Clinical Medicine, University of Oslo, Oslo, Norway
4. Department of Tumour Biology, Oslo University Hospital, Oslo, Norway
5. Department of Gastroenterological Surgery, Oslo University Hospital, Oslo, Norway
6. Institute of Health Management and Health Economics, University of Oslo, Oslo, Norway
7. Department of Surgery 1, Yerevan State Medical University after M. Heratsi, Yerevan, Armenia
8. Department of Surgery, Fonna Hospital Trust, Stord, Norway
9. Department of Faculty Surgery 2, I. M. Sechenov First Moscow State Medical University, Moscow, Russia
10. Department of Gastrointestinal Surgery, Haukeland University Hospital, Bergen, Norway
11. Department of Information Technology, Oslo University Hospital, Oslo, Norway
12. Oslo Centre for Biostatistics and Epidemiology, Research Support Services, Oslo University Hospital, Oslo, Norway
13. Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway
14. Institute of Health and Society, University of Oslo, Oslo, Norway