1. Tommy's National Centre for Miscarriage Research, Queen Charlotte's and Chelsea Hospital Imperial College London London UK
2. Department of Obstetrics and Gynaecology Imperial College Healthcare Trust London UK
3. KU Leuven, Department of Development and Regeneration Leuven Belgium
4. Department of Obstetrics and Gynaecology Chelsea and Westminster NHS Trust London UK
5. Department of Biomedical Data Sciences Leiden University Medical Centre (LUMC) Leiden The Netherlands
6. EPI‐centre, KU Leuven Leuven Belgium
7. Department of Epidemiology, CAPHRI Care and Public Health Research Institute Maastricht University Maastricht The Netherlands
8. Department of Obstetrics and Gynaecology University Hospitals Leuven Leuven Belgium