1. Department of Medicine; Stavanger University Hospital; Stavanger Norway
2. Department of Paediatrics, Norwegian Childhood Diabetes Registry; Oslo University Hospital; Oslo Norway
3. Institute of Clinical Medicine; University of Oslo; Oslo Norway
4. Norwegian Quality Improvement of Primary Care Laboratories (Noklus); Haraldsplass Deaconess Hospital; Bergen Norway
5. Department of Public Health and Primary Health Care; University of Bergen; Bergen Norway
6. Laboratory of Clinical Biochemistry; Haukeland University Hospital; Bergen Norway