1. Women’s Health Research Unit, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
2. Selwyn Crawford Department of Anaesthetics, Birmingham Women’s Hospital, Birmingham, UK
3. School of Health and Related Research (ScHARR), University of Sheffield, Sheffield, UK
4. Pragmatic Clinical Trials Unit, Centre for Primary Care and Public Health, Queen Mary University of London, London, UK
5. Haematology, NHS Blood and Transplant, London, UK
6. Anaesthetics, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
7. Health Economics Unit, University of Birmingham, Birmingham, UK
8. Nottingham Clinical Trials Unit, University of Nottingham, Nottingham, UK
9. Department of Anaesthetics, Singleton Hospital, Swansea, UK
10. Simpson Centre for Reproductive Health, Royal Infirmary of Edinburgh, Edinburgh, UK
11. Women’s Services, Royal Victoria Infirmary, Newcastle upon Tyne, UK
12. Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK
13. Perioperative, Critical Care and Trauma Trials Group, University of Birmingham, Birmingham, UK
14. Royal London Hospital, Barts Health NHS Trust, London, UK