1. NHS Blood and Transplant; Haematology/Transfusion Medicine; Level 2, John Radcliffe Hospital Headington Oxford UK OX3 9BQ
2. NHS Blood and Transplant; Systematic Review Initiative; John Radcliffe Hospital Oxford UK OX3 9BQ
3. University of Oxford; Centre for Statistics in Medicine; Wolfson College Linton Road Oxford Oxfordshire UK OX2 6UD
4. The Ottawa Health Research Institute and the University of Ottawa; Medicine (hematology) and Pathology Centre for Transfusion Research; 725 Parkdale Ave Ottawa Ontario Canada K1Y 4E9
5. McMaster University; 1200 Main Street West Hamilton Ontario Canada L8N 3Z5