1. Sutter Heart and Vascular InstituteSacramento California
2. Emory University Atlanta Georgia
3. University of Colorado HealthFort Collins Colorado
4. Mt. Sinai School of MedicineNew York New York
5. Austin HeartAustin Texas
6. Harper University HospitalDetroit Michigan
7. Midwest Cardiovascular Research FoundationDavenport Iowa
8. The Cleveland ClinicCleveland Ohio