1. Transfusion Outcome Research Collaborative; Department of Epidemiology and Preventive Medicine, Monash University and Australian Red Cross Blood Service; Melbourne Australia
2. Haematology/Transfusion Medicine; NHS Blood and Transplant; Oxford UK
3. Transfusion Research Unit, School of Public Health and Preventive Medicine; Monash University; Melbourne Australia
4. Centre for Statistics in Medicine; University of Oxford; Oxford UK
5. Systematic Review Initiative; NHS Blood and Transplant; Oxford UK
6. National Institute for Health Research (NIHR) Oxford Biomedical Research Centre; Oxford University Hospitals NHS Foundation Trust and University of Oxford; Oxford UK