1. Women's Health and Perinatology Research Group; Department of Clinical Medicine; UiT-The Arctic University of Norway; Tromsø Norway
2. Homerton Fertility Center; Homerton University Hospital; London UK
3. Center for Reproductive Medicine; St. Bartholomew's Hospital; London UK
4. Division of Obstetrics and Gynecology; Department of Clinical Science, Intervention and Technology; Karolinska Institutet and Center for Fetal Medicine; Karolinska University Hospital; Stockholm Sweden