1. The Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus), Haraldsplass Deaconess Hospital , Bergen , Norway
2. Department of Global Public Health and Primary Care , University of Bergen , Bergen , Norway
3. Department of Medical Biochemistry and Pharmacology , Haukeland University Hospital , Bergen , Norway
4. Department of Multidisciplinary Laboratory Medicine and Medical Biochemistry , Akershus University Hospital , Lørenskog , Norway
5. Fürst Medisinsk Laboratorium , Oslo , Norway