1. Centre for Health Services Research School of Health Sciences City, University of London London UK
2. Centre for Behaviour Change University College London London UK
3. NHS Blood and Transplant/ Oxford University Hospitals NHS Foundation Trust John Radcliffe Hospital Oxford UK
4. Oxford Clinical Research in Transfusion Medicine University of Oxford Oxford UK
5. School of Health Sciences University of Melbourne Melbourne Victoria Australia
6. Clinical Epidemiology Program Ottawa Hospital Research Institute Ottawa Ontario Canada