1. Department of Cardiothoracic and Vascular Surgery; National University of Singapore-117597; Singapore
2. National University Medical Institutes, Clinical Research Centre; 10-Medical Drive, National University of Singapore-117597; Singapore
3. National Heart Centre; Singapore
4. Division of Cardiology, Department of Medicine; National University of Singapore-119074; Singapore
5. Departement of Biological Sciences; National University of Singapore; Singapore
6. Cell Therapy Research Foundation; Memphis TN 38117-7126 USA