1. Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, United Kingdom
2. Lindsay Stewart Centre for Audit and Clinical Informatics, Royal College of Obstetricians and Gynaecologists, London, United Kingdom
3. Medway Hospital, Gillingham, Kent, United Kingdom
4. Leicester General Hospital, Department of Obstetrics and Gynaecology, University Hospitals of Leicester, Leicester, United Kingdom
5. Belfast City Hospital, Department of Gynaecology, Lisburn Road, Belfast, Northern Ireland, United Kingdom
6. University of Leicester, Department of Health Sciences, College of Life Sciences, Leicester, United Kingdom