1. KG Jebsen Coeliac Disease Research Centre University of Oslo Oslo 0372 Norway
2. Institute of Clinical Medicine University of Oslo Oslo 0450 Norway
3. Department of Rheumatology Dermatology and Infectious Diseases Oslo University Hospital Oslo 0372 Norway
4. Department of Immunology Oslo University Hospital Oslo 0372 Norway
5. Department of Gastroenterology Akershus University Hospital Lørenskog 1478 Norway
6. Department of Gastroenterology Oslo University Hospital Rikshospitalet Oslo 0372 Norway