1. Center of Perinatal Medicine and Health Department of Obstetrics and Gynecology Institute of Clinical Sciences University of Gothenburg Gothenburg Sweden
2. Department of Obstetrics and Gynecology Region Västra GötalandSahlgrenska University Hospital Gothenburg Sweden
3. Department of Clinical Sciences Karolinska InstitutetDanderyd Hospital Stockholm Sweden
4. Institute of Health and Care Sciences Sahlgrenska AcademyUniversity of Gothenburg Gothenburg Sweden
5. Department of Obstetrics and Gynecology Faculty of Medicine and Health Örebro University Örebro Sweden
6. Department of Women’s and Children’s Health Uppsala University Uppsala Sweden
7. Department of Women’s and Children’s Health Karolinska InstituteKarolinska University Hospital Stockholm Sweden