[1] Institute of Health and Society,Department of General Practice
[2] University of Oslo,Department of Endocrinology, Morbid Obesity and Preventive Medicine
[3] Institute of Clinical Medicine,Norwegian Quality Improvement of Laboratory Examinations
[4] Faculty of Medicine,Department of Global Public Health and Primary Care
[5] University of Oslo,Department of Medicine
[6] Oslo University Hospital,Department of Medicine
[7] Haraldsplass Deaconess Hospital,Department of Clinical Biochemistry and Pharmacology
[8] University of Bergen,General Practice Research Unit (AFE), Department of General Practice
[9] Stavanger University Hospital,undefined
[10] Nordland Hospital,undefined
[11] Haukeland University Hospital,undefined
[12] University of Oslo,undefined
[13] Institute of Health and Society,undefined