1. Section of Cardiology Harry S. Truman VA Hospital Columbia Missouri USA
2. Division of Cardiovascular Disease, Department of Medicine University of Missouri Columbia Missouri USA
3. VA Eastern Colorado Health Care System Veterans Health Administration Aurora Colorado USA
4. Department of Biostatistics and Informatics, Colorado School of Public Health University of Colorado Anschutz Medical Campus Aurora Colorado USA
5. VA CART Program, Office of Quality and Patient Safety Veterans Health Administration Washington District of Columbia USA
6. Section of Cardiology Jesse Brown VA Medical Center Chicago Illinois USA