1. Women's Health and Perinatology Research Group, Department of Clinical MedicineUiT ‐ Arctic University of Tromsø Tromsø Norway
2. Fetal Medicine UnitSt George's Hospital London UK
3. Department of Clinical Science, Intervention & Technology (CLINTEC)Division of Obstetrics and Gynecology, Karolinska Institute, Stockholm Sweden
4. Centre for Fetal MedicineKarolinska University Hospital Stockholm Sweden
5. Department of Obstetrics and GynecologyHelsinki University Hospital Helsinki Finland
6. Department of Obstetrics and GynecologyOulu University Hospital Oulu Finland
7. Oregon Health and Science University Portland OR USA