1. Department of Clinical services, Oslo University Hospital Rikshospitalet, Oslo, Norway
2. K.G. Jebsen Coeliac Disease Research Centre, University of Oslo
3. Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
4. Healthy Life Centre, Municipality of Nes, Årnes, Norway
5. Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
6. Department of Gastroenterology, Oslo University Hospital, Oslo, Norway