1. Department of Pediatric Research, Faculty of Medicine University of Oslo Oslo Norway
2. Celiac Disease Research Center, Faculty of Medicine and Health Technology Tampere University Tampere Finland
3. Children's Hospital, Helsinki University Hospital Helsinki Finland
4. Department of Pediatrics Tampere University Hospital, Wellbeing Services County of Pirkanmaa Tampere Finland
5. Department of Gastroenterology Oslo University Hospital Rikshospitalet Oslo Norway
6. Norwegian Coeliac Disease Research Centre Institute of Clinical Medicine, Faculty of Medicine, University of Oslo Oslo Norway
7. Department of Pediatric and Adolescent Medicine Oslo University Hospital Oslo Norway