1. Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Centre for Translational Medicine, MD6, 14 Medical Drive, Level-8 (South), Singapore 117599, Singapore
2. Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
3. Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre, Singapore, Singapore