1. Department of Haematology University College Hospital London NHS Foundation Trust London UK
2. Patient Services NHS Blood and Transplant London UK
3. Clinical Trials Unit NHS Blood and Transplant Oxford UK
4. Deparment of Medicine University of Oxford Oxford UK
5. Clinical Trials Unit NHS Blood and Transplant Cambridge UK
6. Statistics and Clinical Studies Unit NHS Blood and Transplant Filton UK
7. Department of Haematology University of Manchester Manchester UK
8. Serious Hazards of Transfusion (SHOT) NHS Blood and Transplant Manchester UK