1 Department of Obstetrics and Gynecology, Radboud University Medical Center, P.O. Box 9101, 6500HB, Nijmegen, The Netherlands. tinekevergeldt@gmail.com.
2 Department of Obstetrics and Gynecology, Atrium Medical Center Parkstad, Heerlen, The Netherlands.
3 Department for Health Evidence, Radboud University Medical Center, Nijmegen, The Netherlands.
4 Department of Obstetrics and Gynecology, Radboud University Medical Center, P.O. Box 9101, 6500HB, Nijmegen, The Netherlands.