1. Clinical Services NHS Blood and Transplant Cambridge UK
2. Department of Haematology University of Cambridge Cambridge UK
3. Clinical Services NHS Blood and Transplant London UK
4. Department of Emergency Medicine, Barts Health NHS Trust London UK
5. Department of Pathology University of Pittsburgh Pittsburgh Pennsylvania USA
6. Department of Haematology, Barts Health NHS Trust London UK
7. Blizard Institute Queen Mary University of London London UK