1. Center of Fetal Medicine and Pregnancy, Department of Obstetrics Copenhagen University Hospital Rigshospitalet, CopenhagenDenmark
2. Department of Obstetrics and Gynecology Medical University of Vienna ViennaAustria
3. Department of Obstetrics and Gynecology University Hospital Roskilde RoskildeDenmark
4. Faculty of Health Sciences University of Copenhagen CopenhagenDenmark
5. Department of Obstetrics and Gynecology General Hospital of Klagenfurt KlagenfurtAustria
6. Department of Obstetrics and Gynecology Medical University of Innsbruck InnsbruckAustria
7. Mothers and Babies Research Center/Hunter Medical Research Institute John Hunter Hospital, Faculty of Health/School of Medicine and Public Health University of Newcastle Newcastle NSWAustralia
8. Department of Clinical Biochemistry Herlev and Gentofte Hospital Copenhagen University Hospital, Copenhagen Denmark