1. Department of Medical Biochemistry and Pharmacology Haukeland University Hospital Helse Bergen Bergen Norway
2. Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus) Haraldsplass Deaconess Hospital Bergen Norway
3. Department of Pediatrics Haukeland University Hospital Bergen Norway
4. Department of Clinical Chemistry Trondheim University Hospital Trondheim Norway
5. Hormone Laboratory Haukeland University Hospital Helse Bergen Bergen Norway
6. Department of Clinical Science University of Bergen Bergen Norway