1. Mayo Clinic; Jacksonville Florida
2. Division of Cardiology, Department of Medicine; Rush University; Chicago Illinois
3. Division of Cardiology; New York University School of Medicine; New York
4. Mount Sinai Medical Center; New York
5. Baylor HealthCare System; Dallas Texas
6. VA North Texas Healthcare System and UT Southwestern Medical School; Dallas Texas
7. Oschner Clinic; New Orleans Luisiana
8. Stern Cardiovascular Foundation; Memphis Tennessee
9. Medical City Dallas Hospital; Dallas Texas
10. Columbia University Medical Center, New York Presbyterian Hospital and The Cardiovascular Research Foundation; New York City New York