1. Centre for Women's Health, Institute of Population Health, Queen Mary University London London UK
2. School of Medicine, University of Glasgow Glasgow UK
3. Department of Obstetrics and GynaecologyUniversity of Cambridge, NIHR Cambridge Comprehensive Biomedical Research Centre Cambridge UK
4. Bristol NIHR Biomedical Research Centre Bristol UK
5. MRC Integrative Epidemiology Unit at the University of Bristol Bristol UK
6. Population Health, Bristol Medical School, University of Bristol Bristol UK
7. Institute of Health and WellbeingUniversity of Glasgow Glasgow UK