1. Division of Cardiology; University of Texas Southwestern Medical Center; Dallas Texas
2. North Florida/South Georgia Veterans Health System and Division of Cardiology; University of Florida; Gainesville FL
3. Heart and Vascular Institute, Cleveland Clinic; Cleveland Ohio
4. New York University School of Medicine; New York New York
5. Deutsches Herzzentrum; Technische Universität; Munich Germany
6. Division of Cardiology; Baylor College of Medicine; Houston Texas
7. Brigham and Women's Hospital, Heart & Vascular Center and Harvard Medical School; Boston Massachusetts