Affiliations

• ¹ Department of Obstetrics and Gynaecology, University of Groningen, University Medical Center Groningen, 9700RB Groningen, The Netherlands a.m.van.oers@umcg.nl.
• ² Department of Epidemiology, University of Groningen, University Medical Center Groningen, 9700RB Groningen, The Netherlands.
• ³ Department of Obstetrics and Gynaecology, University of Groningen, University Medical Center Groningen, 9700RB Groningen, The Netherlands.
• ⁴ Department of General Practice, University of Utrecht, University Medical Center Utrecht, 3508GA Utrecht, The Netherlands.
• ⁵ Department of Obstetrics and Gynaecology, Scheper Hospital, Department of Obstetrics and Gynaecology, 7800RA Emmen, The Netherlands.
• ⁶ Department of Obstetrics and Gynaecology, Isala Clinics, 8000GK Zwolle, The Netherlands.
• ⁷ Department of Obstetrics and Gynaecology, Medical Center Leeuwarden, 8901BR Leeuwarden, The Netherlands.
• ⁸ Department of Obstetrics and Gynaecology, Maxima Medical Center, 5500MB Veldhoven, The Netherlands.
• ⁹ Department of Obstetrics and Gynaecology, University of Maastricht, Maastricht University Medical Center, 6202AZ Maastricht, The Netherlands.
• ¹⁰ Department of Obstetrics and Gynaecology, OLVG, 1090HM Amsterdam, The Netherlands.
• ¹¹ Department of Obstetrics and Gynaecology, Deventer Hospital, 7400GC Deventer, The Netherlands.
• ¹² Department of Obstetrics and Gynaecology, St. Antonius Hospital, 3430EM Nieuwegein, The Netherlands.
• ¹³ Department for Reproductive Medicine, Division Female and Baby, University of Utrecht, University Medical Center Utrecht, 3508GA Utrecht, The Netherlands.
• ¹⁴ Department of Obstetrics and Gynaecology, Martini Hospital, 9700RM Groningen, The Netherlands.
• ¹⁵ The Robinson Research Institute, School of Pediatrics and Reproductive Health, University of Adelaide, 5000SA Adelaide, Australia.