1. Women's Health and Perinatology Research Group; Department of Clinical Medicine; UiT-The Arctic University of Norway; Tromsø Norway
2. Department of Obstetrics and Gynecology; University Hospital of Northern-Norway; Tromsø Norway
3. Division of Obstetrics and Gynecology; Department of Clinical Science, Intervention and Technology; Karolinska Institute; Stockholm Sweden
4. Department of Clinical Medicine; Neuromuscular Disorders Research Group; UiT-The Arctic University of Norway; Tromsø Norway