1. Nuffield Division of Clinical Laboratory Sciences, Radcliffe Department of Medicine; University of Oxford; Oxford UK
2. Systematic Review Initiative; NHS Blood and Transplant; Oxford UK
3. Department of Surgical Sciences; University of Oxford; Oxford UK
4. William Harvey Research Institute, Barts and the London; Queen Mary University of London; London UK
5. Stem Cell Research Laboratory, NHS Blood and Transplant, Oxford Centre; Oxford UK
6. Cochrane Heart Group, Farr Institute of Health Informatics Research, University College London; London UK