1. Addenbrooke's Hospital; Cambridge UK
2. Obstetrics & Gynaecology; Nottingham University Hospitals NHS Trust; Nottingham UK
3. Obstetrics & Gynaecology; Chelsea and Westminter Hospital; London UK
4. Department of Obstetrics and Gynaecology; Showa University Hospital; Tokyo Japan
5. Showa University Research Administration Center (SURAC); Showa University; Tokyo Japan
6. Institute of Health & Society; Newcastle University; Newcastle upon Tyne UK
7. Biostatistics; Showa University Research Administration Center, Showa University; Tokyo Japan
8. Department of Pathology; University of Cambridge; Cambridge UK
9. Department of Gynaecological Oncology; 1st Floor Maternity Unit, City Hospital Campus; Nottingham UK