1. Department of Healthcare Policy and Research, Weill Cornell Medical College, New York, New York
2. Division of Cardiology, University of California San Francisco School of Medicine, San Francisco
3. Division of Cardiology, Department of Medicine, University of Colorado Denver, Aurora
4. Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, Maryland
5. Medstar Heart and Vascular Institute, Department of Cardiac Surgery, Washington Hospital Center, Washington, Maryland
6. Cardiovascular Surgery, Baylor Health Care System, Plano, Texas