1. Division of Cardiology; Denver VA, University of Colorado; Denver Colorado
2. Division of Cardiology; Corporal Michael C. Crescenz VA Medical Center, Penn Cardiovascular Outcomes, Quality, & Evaluative Research Center; Philadelphia Pennsylvania
3. Division of Cardiology; San Francisco VA, University of California; San Francisco San Francisco California
4. Division of Cardiology; Dallas VA, University of Texas Southwestern; Dallas Texas