1. Department of Medical Biochemistry and Pharmacology, Haukeland University Hospital, Bergen, Norway
2. Department of Clinical Science, University of Bergen, Norway
3. Medical Library, University of Bergen, Norway
4. Section of Clinical Allergy, Department of Occupational Diseases, Haukeland University Hospital, Bergen, Norway
5. Norwegian Organization for Quality Improvement of Laboratory Examinations, Haraldsplass Deaconess Hospital, Bergen, Norway