1. Division of Gastroenterology, Department of Medicine, Haukeland University Hospital, Bergen, Norway;
2. Norwegian Competence Center for Functional Gastrointestinal Disorders, Section of Gastroenterology, Department of Medicine, Haukeland University Hospital, Bergen, Norway;
3. Center for Nutrition, Department of Clinical Medicine, University of Bergen, Bergen, Norway;
4. Norwegian PSC Research Center and Section of Gastroenterology and Research Institute of Internal Medicine, Oslo University Hospital and University of Oslo, Oslo, Norway;
5. Unger-Vetlesen Institute, Lovisenberg Diaconal Hospital, Oslo, Norway;
6. Division of Gastroenterology, Department of Medicine, Stord Hospital, Helse-Fonna, Stord, Norway