1. IVO Research Institute, The Hague, The Netherlands
2. Department of Health Promotion, Maastricht University (CAPHRI), Maastricht, The Netherlands
3. Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands
4. Department of Obstetrics and Gynaecology, Catharina Hospital Eindhoven, The Netherlands
5. Netherlands Comprehensive Cancer Organisation, Utrecht, The Netherlands
6. National Health Care Institute, Diemen, The Netherlands