1. Department of Obstetrics and Gynecology Stellenbosch University Cape Town South Africa
2. Department of Obstetrics and Gynecology Institute of Clinical Sciences Sahlgrenska AcademyUniversity of Gothenburg Gothenburg Sweden
3. Department of Women’s and Children’s Health Uppsala University Uppsala Sweden
4. Department of Reproductive and Perinatal Health Institute of Health and Care Sciences Sahlgrenska AcademyUniversity of Gothenburg Gothenburg Sweden
5. Center for Clinical Research Uppsala University Uppsala Sweden
6. Department of Obstetrics and Gynecology Faculty of Medicine Lund University Lund Sweden
7. Department of Obstetrics and Gynecology University Medical Center Groningen Groningen the Netherlands
8. Mercy PerinatalMelbourne University Melbourne Australia