1. Department of Clinical Science, University of Bergen, Bergen, Norway
2. Children and Youth Clinic, Haukeland University Hospital, Bergen, Norway
3. VID Specialized University, Bergen, Norway
4. Hormone Laboratory, Department of Medical Biochemistry and Pharmacology, Haukeland University Hospital, Bergen, Norway
5. Department of Paediatrics and Adolescents, Stavanger University Hospital, Stavanger, Norway
6. Department of Radiology, University Hospital of North Norway, Tromsø, Norway
7. Department of Clinical Medicine, the Artic University of Norway, Tromsø, Norway
8. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
9. Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
10. Department of Epidemiology and Biostatistics, University at Albany, Albany, New York, USA
11. Center for the Elimination of Minority Health Disparities, University at Albany, Albany, New York, USA
12. Department of Public Health and Primary Care, University of Leuven, Belgium