1. Women's Health and Perinatology Research Group, Department of Clinical Medicine; Faculty of Health Sciences, University of Tromsø-the Arctic University of Norway; Tromsø Norway
2. Department of Obstetrics and Gynecology; University Hospital of North Norway; Tromsø Norway
3. Department of Community Medicine; Faculty of Health Sciences, University of Tromsø-the Arctic University of Norway; Tromsø Norway
4. Department of Obstetrics and Gynecology; University of South Florida, Morsani College of Medicine, Division of Maternal-Fetal Medicine, South Tampa Center for Advanced HealthCare; Tampa Florida USA
5. Department of Clinical Science; Intervention, and Technology, Karolinska Institute; Stockholm Sweden