1. Faculty of Health; Oslo and Akershus University College of Applied Science; Oslo Norway
2. Department of Radiology; University Hospital of North Norway; Tromsø Norway
3. Homebirth Association; Region Zealand; Sorø Denmark
4. Unit for Clinical Genetics; Oslo University Hospital; Oslo Norway
5. The Research Unit; Women's and Children's Health; The Juliane Marie Centre for Women, Children and Reproduction; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
6. Department of Midwifery; Faculty of Nursing; University of Iceland; Reykjavík Iceland
7. Department of Obstetrics and Gynecology; University Hospital of North Norway; Tromsø Norway
8. Women's Health and Perinatology Research Group; Department of Clinical Medicine; Faculty of Health Sciences; University of Tromsø; Tromsø Norway
9. Department of Women's and Children's Health; Karolinska Institutet; Stockholm Sweden