1. Department of Obstetrics and Gynaecology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
2. Amsterdam Reproduction and Development Research Institute, Amsterdam UMC, Amsterdam, The Netherlands
3. Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
4. Amsterdam Public Health Research Institute, Amsterdam UMC, Amsterdam, The Netherlands
5. Department of Obstetrics and Gynaecology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
6. Department of Epidemiology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
7. Department of Gynaecology and Obstetrics, Ziekenhuis Amstelland, Amstelveen, The Netherlands
8. Department of Gynaecology and Obstetrics, Wilhelmina Children's Hospital Birth Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
9. Medical Library, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
10. Department of Obstetrics and Gynaecology, Erasmus University Medical Centre, Rotterdam, The Netherlands
11. Department of Internal Medicine, Erasmus University Medical Centre, Rotterdam, The Netherlands