1. Section of Cardiology, University of Washington, Seattle
2. Duke Clinical Research Institute, Durham, North Carolina
3. University of Colorado School of Medicine, Aurora
4. Cleveland Clinic, Cleveland, Ohio
5. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
6. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas6Baylor College of Medicine, Houston, Texas
7. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas6Baylor College of Medicine, Houston, Texas7Houston Methodist DeBakey Heart and Vascular Center, Houston, Texas
8. Houston Methodist DeBakey Heart and Vascular Center, Houston, Texas8Weill Cornell Medical College, New York, New York