1. Section of Cardiology, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
2. Division of General Internal Medicine, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
3. Section of Cardiovascular Research, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
4. Health Policy, Quality & Informatics Program, Michael E. DeBakey VA Medical Center Health Services Research & Development Center for Innovations in Quality, Effectiveness, and Safety, Houston, Texas, USA.
5. Section of Health Services Research, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
6. Section of Cardiology, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA.