1. John Radcliffe Hospital; Oxford UK OX3 9DU
2. Addenbrooke's Hospital; University Department of Anaesthetics; Hill Road Cambridge UK CB2 0QQ
3. John Radcliffe Hospital; NHS Blood and Transplant; Level 2, Headley Way Headington Oxford UK OX3 9BQ
4. NHS Blood and Transplant; Systematic Review Initiative; Level 2, John Radcliffe Hospital Headington Oxford Oxon UK OX3 9BQ
5. Sunnybrook Health Sciences Centre and Department of Laboratory Medicine and Pathobiology, University of Toronto; Department of Clinical Pathology; 2075 Bayview Avenue, Room B204 Toronto Ontario Canada M4N 3M5
6. NHS Blood and Transplant; Haematology/Transfusion Medicine; Level 2, John Radcliffe Hospital Headington Oxford UK OX3 9BQ