1. Department of Pediatric and Adolescent Medicine; Akershus University Hospital; Lørenskog Norway
2. Department of Obstetrics and Gynecology; Haukeland University Hospital; Bergen Norway
3. Department of Clinical Science; University of Bergen; Bergen Norway
4. Norwegian National Advisory Unit on Women`s Health; Women's Clinic; Oslo University Hospital; Oslo Norway
5. Institute of Clinical Medicine; University of Oslo; Oslo Norway
6. Institute of Clinical Medicine; University of Oslo; Lørenskog Norway
7. Department of General Practice; Institute of Health and Society; University of Oslo; Oslo Norway