1. Department of Obstetrics and Gynaecology Royal Surrey NHS Foundation Trust Guildford UK
2. Women's Health Division, Blizard Institute Queen Mary University London London UK
3. Institute of Population Health Sciences Queen Mary University of London London UK
4. Department of Obstetrics and Gynaecology St. George's University Hospitals NHS Foundation Trust London UK
5. Department of Preventative Medicine and Public Health Universidad de Granada Granada Spain
6. Department of Gynaecological Oncology Royal Surrey NHS Foundation Trust Guildford UK
7. Wolfson Institute of Population Health, Barts CRUK Cancer Centre Queen Mary University of London London UK
8. Department of Gynaecological Oncology Barts Health NHS Trust London UK
9. Department of Health Services Research and Policy London School of Hygiene & Tropical Medicine London UK