1. Center of Perinatal Medicine and Health Department of Obstetrics and Gynecology Institute of Clinical Sciences Sahlgrenska AcademyUniversity of Gothenburg Gothenburg Sweden
2. Department of Obstetrics Sahlgrenska University Hospital Gothenburg Sweden
3. Södra Älvsborg Hospital Borås Sweden
4. Center for Clinical Research Dalarna Falu Hospital Falun Sweden
5. Department of Clinical Science, Intervention and Technology Karolinska Institute Stockholm Sweden
6. Center for Fetal Medicine Karolinska University Hospital Stockholm Sweden
7. Department of Obstetrics and Gynecology Faculty of Medicine and Health Örebro University Örebro Sweden
8. Department of Obstetrics and Gynecology Skåne University Hospital Malmö Sweden
9. Department of Clinical Sciences Malmö Lund University Lund Sweden