1. Division of General Internal Medicine; Rutgers Robert Wood Johnson Medical School; New Brunswick New Jersey USA
2. John Radcliffe Hospital; Oxford University Hospitals NHS Foundation Trust; Oxford UK
3. Radcliffe Department of Medicine, NIHR Oxford Biomedical Research Centre; University of Oxford; Oxford UK
4. Systematic Review Initiative; NHS Blood and Transplant; Oxford UK
5. Cochrane Injuries Group; London School of Hygiene & Tropical Medicine; London UK
6. Department of Cardiovascular Medicine; University of Oxford; Oxford UK
7. Kaiser Permanente Division of Research Northern California; Oakland California USA
8. Clinical Epidemiology Program; Ottawa Hospital Research Institute; Ottawa Canada
9. The Institute for Transfusion Medicine; University of Pittsburgh; Pittsburgh PA USA
10. Centre for Research; University of Montreal Hospital Research Centre; Montreal Canada