1. Division of Cardiology, Winthrop University Hospital, Mineola, New York
2. Warren Alpert Medical School of Brown University, Cardiovascular Institute, Providence, RI
3. West Valley Medical Center, Caldwell, ID
4. FirstHealth of the Carolinas, Pinehurst, NC
5. Cardiovascular Medicine Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
6. University of Illinois School of Medicine-Peoria, Peoria, IL
7. University of Oklahoma and VA Medical Center, Oklahoma City, OK
8. University of Pittsburgh and VA Pittsburgh Healthcare System, Pittsburgh, PA
9. Duke University Medical Center, Durham, NC
10. Weill Cornell Medical College, New York-Presbyterian Hospital, Greenberg Division of Cardiology, New York, NY
11. Geisinger Medical Center, Danville, PA