1. Department of Obstetrics and Gynecology, Maastricht University Medical Center, Maastricht, Netherlands
2. Department of Epidemiology, Maastricht University, Maastricht, Netherlands
3. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, Netherlands
4. Department of Clinical Epidemiology and Medical Technology Assessment, Maastricht University Medical Center, Maastricht, Netherlands
5. Department of Obstetrics and Gynecology, University Medical Center Utrecht, Utrecht, Netherlands
6. Department of Obstetrics and Gynecology, Academic Medical Center, Amsterdam, Netherlands
7. Department of Obstetrics and Gynecology, St. Antonius Hospital, Nieuwegein, Netherlands