1. Division of Cardiovascular Medicine; University of California; Davis Medical Center; Sacramento; California
2. Division of Cardiology; University of California; San Francisco; California
3. Department of Epidemiology and Biostatistics; University of California; San Francisco; California
4. Division of Cardiology; New York University Medical Center; New York
5. Division of Cardiology; St Joseph Mercy Hospital; Ypsilanti; Michigan
6. Division of Cardiology; Oklahoma Cardiovascular Research Group; Oklahoma City; Oklahoma
7. Division of Cardiology; Intermountain Medical Center; Murray; Utah
8. Division of Cardiology; Evanston Hospital; NorthShore University HealthSystem; Evanston; IL