1. Norwegian PSC Research Center, Division of Cancer Medicine, Surgery and Transplantation; Oslo University Hospital; Rikshospitalet; Oslo Norway
2. Department of Clinical Medicine; University of Bergen; Bergen Norway
3. Department of Medicine; National Centre for Ultrasound in Gastroenterology; Haukeland University Hospital; Bergen Norway
4. Institute of Clinical Medicine; University of Oslo; Oslo Norway
5. Section of Gastroenterology; Division of Cancer Medicine, Surgery and Transplantation; Department of Transplantation Medicine; Oslo University Hospital; Rikshospitalet; Oslo Norway