1. Department of Medicine McGuire VAMC Richmond Virginia USA
2. Pauley Heart Center Virginia Commonwealth University Richmond Virginia USA
3. Department of Biostatistics University of Colorado Aurora Colorado USA
4. VA CART Program VHA Office of Quality and Safety Washington District of Columbia USA
5. Department of Medicine Rocky Mountain Regional VA Medical Center Aurora Colorado USA
6. Department of Medicine University of Colorado School of Medicine Aurora Colorado USA
7. The Durham VA Health System Durham North Carolina USA
8. Minneapolis Heart Institute Minneapolis Heart Institute Foundation Minneapolis Minnesota USA