1. Plasticell Ltd., Stevenage Bioscience Catalyst, Stevenage, United Kingdom
2. Stem Cell Research, Nuffield Division of Clinical Laboratory Medicine, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom.
3. Stem Cell Research, NHS Blood and Transplant, Radcliffe Department of Medicine, John Radcliffe Hospital, Oxford, United Kingdom.
4. Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, South Kensington, United Kingdom.