1. Minneapolis Heart Institute, Abbott Northwestern Hospital; Minneapolis Minnesota
2. Division of Invasive Cardiology, Second Department of Internal Medicine and Cardiology Center; University of Szeged; Szeged Hungary
3. VA North Texas Health Care System and University of Texas Southwestern Medical Center; Dallas Texas
4. Columbia University; New York New York
5. Henry Ford Hospital; Detroit Michigan
6. University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
7. Baylor Heart and Vascular Hospital; Dallas Texas
8. Massachusetts General Hospital; Boston Massachusetts
9. Medical Center of the Rockies; Loveland Colorado
10. VA San Diego Healthcare System and University of California San Diego; La Jolla California
11. VA Central Arkansas Healthcare System; Little Rock Arkansas