1. Department of Cardiovascular Surgery, Marcus Valve Center, Piedmont Heart Institute, Atlanta, Georgia, USA
2. Divison of Cardiology, Duke University School of Medicine, Durham, North Carolina, USA
3. Department of Cardiothoracic Surgery, Fiona Stanley Hospital, Perth, Australia
4. Department of Statistics, University of California San Diego, La Jolla, California, USA
5. Department of Statistics, Boston Consulting Group, Boston, Massachusetts, USA
6. Edwards Lifesciences, Irvine, California, USA
7. Division of Cardiology, Columbia University Medical Center and New York Presbyterian Hospital, New York, NY, USA