1. Department of Cardiology; Geisinger Medical Center; Danville; Pennsylvania
2. Seton Heart Institute; Austin; Texas
3. Division of Cardiology; Weill Cornell Medical College; New York; New York
4. Department of Cardiology; Texas A&M College of Medicine; Temple; Texas
5. Department of Cardiology; Ochsner Clinic Foundation; New Orleans; Los Angeles
6. Department of Cardiology; Mayo Clinic; Rochester; Minnesota
7. Ohio Health Research Institute; Riverside Methodist Hospital; Columbus; Ohio
8. Department of Cardiology; Hershey Medical Center; Hershey; Pennsylvania