1. Department of Dermatology; Stavanger University Hospital; Stavanger Norway
2. Section of Biostatistics; Department of Research; Stavanger University Hospital; Stavanger Norway
3. Department of Medical Biochemistry; Stavanger University Hospital; Stavanger Norway
4. Department of Pathology; Stavanger University Hospital; Stavanger Norway
5. Clinical Immunology Unit; Department of Internal Medicine; Stavanger University Hospital; Stavanger Norway
6. Department of Clinical Science; Faculty of Medicine and Dentistry; University of Bergen; Bergen Norway