1. Department of Obstetrics and Gynaecology St Mary's Hospital, Manchester NHS Foundation Trust Manchester UK
2. School of Medicine University of Glasgow Glasgow UK
3. Department of Radiology St George's Hospital and Medical School London UK
4. Department of Primary Care University of Oxford Oxford UK
5. Nottingham Clinical Trials Unit University of Nottingham Nottingham UK
6. Department of Gynaecology St George's Hospital and Medical School London UK
7. Birmingham Clinical Trials Unit University of Birmingham Birmingham UK
8. Institute of Health and Wellbeing University of Glasgow Glasgow UK