1. Division of Obstetrics and Gynecology; Department of Clinical Science, Intervention and Technology; Karolinska Institutet; Stockholm Sweden
2. Obstetrics; and Gynecology, Hospital of Fudan University; Shanghai China
3. Women's Health and Perinatology Research Group; Department of Clinical Medicine; UiT-The Arctic University of Norway and University Hospital of North Norway; Tromsø Norway
4. Center for Fetal Medicine; Karolinska University Hospital; Stockholm Sweden