1. Department of Clinical Science, University of Bergen, Bergen, Norway;
2. National Advisory Center for Tropical Infectious Diseases, Department of Medicine, Haukeland University Hospital, Bergen, Norway;
3. Centre for Cancer Biomarkers CCBIO, Department of Clinical Medicine, University of Bergen, Bergen, Norway;
4. Department of Pathology, Haukeland University Hospital, Bergen, Norway;
5. National Centre of Functional Gastrointestinal Disorders, Section of Gastroenterology, Department of Medicine, Haukeland University Hospital, Bergen, Norway