1. Institute for Social Research, Norway
2. Clinical Trials Unit, Oslo University Hospital, Norway
3. Department for Disease Burden, Norwegian Institute of Public Health, Norway
4. Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus), Haraldsplass Deaconess Hospital, Norway
5. Department for Global Public Health and Primary Care, University of Bergen, Norway
6. Department of Health Registry Research and Development, Norwegian Institute of Public Health, Norway
7. Department of Clinical Science, University of Bergen, Norway
8. Children and Youth Clinic, Haukeland University Hospital, Norway
9. Centre for Fertility and Health, Norwegian Institute of Public Health, Norway
10. Department of Economics, University of Oslo, Norway