1. Blizard Institute Barts and the London School of Medicine Queen Mary University of London London UK
2. Department of Haematology Barts Health NHS Trust London UK
3. Department of Cardiac Surgery Barts Health NHS Trust London UK
4. William Harvey Research Institute Barts and the London School of Medicine Queen Mary University of London London UK
5. Department of Anaesthesia Manchester Royal Infirmary Manchester UK
6. Systematic Review Initiative NHS Blood and Transplant Oxford UK
7. Department of Anaesthesia University Hospital Southampton Southampton UK
8. William Harvey Research Institute Barts and The London School of Medicine and Dentistry Queen Mary University of London London UK
9. Department of Anaesthesia Royal Papworth Hospital Cambridge UK
10. Department of Haematology Oxford University Hospitals NHS Foundation Trust Oxford UK
11. Department of Anaesthesia Barts Health NHS Trust London UK
12. NHS Blood and Transplant Oxford UK
13. Outcomes Research Consortium, Cleveland Clinic OH USA