1. Department of Rheumatology, Division of Medicine, District General Hospital of Førde, Førde, Norway;
2. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway;
3. Bergen group of Epidemiology and Biomarkers in Rheumatic Disease (BeABird), Department of Rheumatology, Haukeland University Hospital, Bergen, Norway;
4. Faculty of Health and Social Sciences, Western Norway University of Applied Sciences, Bergen, Norway;
5. Department of Gastroenterology, Oslo University Hospital Rikshospitalet, Oslo, Norway;
6. KG Jebsen Coeliac Disease Research Centre, University of Oslo, Oslo, Norway