1. Division of Rheumatology and Research Diakonhjemmet Hospital Oslo Norway
2. Institute of Clinical Medicine University of Oslo Oslo Norway
3. Department of Gastroenterology Akershus University Hospital Lørenskog Norway
4. Department of Medical Biochemistry Oslo University Hospital Oslo Norway
5. Section of Dermatology Oslo University Hospital Oslo Norway
6. Department of Research Support for Clinical Trials Oslo University Hospital Oslo Norway
7. Akershus Dermatology Center Lørenskog Norway