1. Department of Epidemiology and Biostatistics, the Netherlands Cancer Institute, Amsterdam, the Netherlands
2. Department of Obstetrics and Gynecology, VU University Medical Center, Amsterdam, the Netherlands
3. Department of Reproductive Medicine and Gynecology, University Medical Center Utrecht, Utrecht, the Netherlands
4. Department of Obstetrics and Gynecology, Erasmus Medical Center, Rotterdam, the Netherlands
5. Department of Reproductive Medicine, Reinier de Graaf Hospital, Voorburg, the Netherlands
6. Department of Obstetrics, Gynecology, and Reproductive Medicine, Leiden University Medical Center, Leiden, the Netherlands
7. Department of Obstetrics and Gynecology, Isala Clinics, Zwolle, the Netherlands
8. Department of Obstetrics and Gynecology, Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands
9. Department of Obstetrics and Gynecology, St Elisabeth Hospital, Tilburg, the Netherlands
10. Department of Obstetrics and Gynecology, University Medical Center Groningen, University Groningen, Groningen, the Netherlands.
11. Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Academic Medical Center, Amsterdam, the Netherlands
12. Department of Obstetrics and Gynecology, Maastricht University Medical Center, Maastricht, the Netherlands
13. Department of Obstetrics and Gynecology, Catharina Hospital, Eindhoven, the Netherlands