1. Department of Gastroenterology, Oslo University Hospital, Oslo, Norway
2. Institute of Clinical Medicine, University of Oslo, Oslo, Norway
3. Department of Rheumatology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
4. Faculty of Health Sciences, OsloMet, Oslo, Norway
5. R&D Department, Vestfold Hospital Trust, Tønsberg, Norway
6. Department of Gastroenterology, Akershus University Hospital, Lørenskog, Norway