1. Geisinger Medical Center; Danville; Pennsylvania
2. Northeast Georgia Heart Center; Gainesville; Georgia
3. Beth Israel Deaconess Medical Center; Boston; Massachusetts
4. University of Texas Health Science Center at San Antonio; San Antonio; Texas
5. University of Michigan Hospitals and Health Centers; Ann Arbor; Michigan
6. Medical City Hospital; Dallas; Texas
7. Detroit Medical Center Cardiovascular Institute; Detroit; Michigan
8. Hershey Medical Center; Hershey; Pennsylvania