1. Royal College of Anaesthetists , London , UK
2. NIHR Southampton Biomedical Research Centre, University Hospital Southampton/University of Southampton , Southampton , UK
3. NHS Blood and Transplant, Oxford University Hospitals NHS Foundation Trust and the University of Oxford , Oxford , UK
4. Clinical Trials Unit, London School of Hygiene and Tropical Medicine , London , UK
5. University of Leicester , Leicester , UK
6. Royal College of Surgeons of England , London , UK
7. University of Liverpool , Liverpool , UK
8. Royal College of Physicians , London , UK