1. National Heart Centre Singapore, 5 Hospital Drive, Singapore
2. Department of Cardiology, University Medical Center Groningen, University of Groningen, AB31, Hanzeplein 1, Groningen, the Netherlands
3. Duke-National University of Singapore Medical School, Singapore
4. Cardiovascular Research Institute, National University Heart Centre, Singapore
5. Harvard Medical School, Harvard University, Boston, MA, USA
6. Division of Cardiovascular Medicine, Brigham and Women’s Hospital, 75 Francis St, Boston, MA, USA