1. Department of Development and Regeneration KU Leuven Leuven Belgium
2. Tommy's National Centre for Miscarriage Research Queen Charlotte's & Chelsea Hospital Imperial College London UK
3. St Marys' Hospital London UK
4. Chelsea and Westminster NHS Trust London UK
5. Hillingdon Hospital London UK
6. Wexham Park Hospital Slough UK
7. Royal Surrey County Hospital Guildford UK
8. Department of Epidemiology CAPHRI Care and Public Health Research Institute Maastricht University Maastricht The Netherlands
9. Department of Obstetrics and Gynaecology University Hospitals Leuven Leuven Belgium
10. Department of Biomedical Data Sciences Leiden University Medical Centre Leiden The Netherlands
11. EPI‐Centre, KU Leuven Leuven Belgium