1. Department of Medicine; Veterans Affairs Long Beach Health Care System; Long Beach California
2. Department of Medicine; University of Califonia, Irvine Medical Center; Orange California
3. Department of Medicine; University of California, San Francisco Medical Center; San Francisco California
4. Department of Medicine; University of California, Los Angeles Medical Center; Los Angeles California
5. Central Coast Comprehensive Cardiovascular Imaging; Santa Maria California
6. Cardiothoracic Department; St Jude Medical Center; Fullerton California
7. Oklahoma Heart Hospital; Midwest City Oklahoma
8. Department of Cardiology; INTEGRIS Heart Hospital; Oklahoma City Oklahoma
9. Department of Medicine, Cardiovascular section; University of Oklahoma Health Sciences Center; Oklahoma City Oklahoma