1. NHS Blood and Transplant; Systematic Review Initiative; Level 2, John Radcliffe Hospital Headington Oxford Oxon UK OX3 9BQ
2. PLA General Hospital, Institute of Cardiac Surgery; Department of Cardiovascular Surgery; 28 Fuxing Road Beijing China 100853
3. William Harvey Research Institute; Department of Clinical Pharmacology; Charterhouse Square London UK EC1M 6BQ
4. NHS Blood and Transplant; Stem Cell Research Department; John Radcliffe Hospital Headington Oxford UK OX3 9BQ