1 Department of Gastrointestinal Surgery, Østfold Hospital Trust, Grålum 1714, Norway; Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Chair of Faculty Surgery Number 2, IM Sechenov First Moscow State Medical University, Moscow, Russia; Department of Surgery Number 1, Yerevan State Medical University after M Heratsi, Yerevan, Armenia. Electronic address: kazair@so-hf.no.
2 Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Department of Hepatopancreatobiliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
3 Institute of Global Health Innovation, Imperial College London, London, United Kingdom.
4 Pediatric Cancer and Blood Disorders Centre of Armenia, Haematology Centre after R Yeolyan, Yerevan, Armenia; Department of Paediatric Oncology and Haematology, Yerevan State Medical University after MnHeratsi, Yerevan, Armenia.
5 Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Department of Surgery Number 1, Yerevan State Medical University after M Heratsi, Yerevan, Armenia; Department of Hepatopancreatobiliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway.
6 Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Department of Hepatopancreatobiliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway.
7 Department of Hepatopancreatobiliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway.
8 Department of Digestive Oncologic and Metabolic Surgery, Institut Mutualiste Montsouris, Université Paris Descartes, Paris, France.