1. Department of Women's and Children's Health; Division of Obstetrics and Gynecology; Karolinska Institutet; Stockholm Sweden
2. Department of Health; Nutrition and Management; Oslo and Akershus University College of Applied Sciences; Norway
3. Department of Obstetrics and Gynecology; Ghent University Hospital; Belgium
4. Faculty of Health and Society; Malmö University; Malmö Sweden
5. Department of Obstetrics and Gynecology; University of Tartu; Estonia
6. Faculty of Nursing and Department of Obstetrics and Gynecology; Department of Midwifery; University of Iceland; Landspitalinn University Hospital; Reykjavik Iceland
7. Department of Ultrasound; Rigshospitalet; at the time of the study; now a consultant midwife at The Danish Association of Midwives; Copenhagen Denmark
8. Department of Public Health and General Practice; Norwegian University of Science and Technology
9. Department of Obstetrics and Gynecology; St. Olav's University Hospital; Trondheim Norway