1. Medical Care Line, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
2. Infectious Diseases Section, Department of Medicine, Baylor College of Medicine, Houston, Texas
3. Center for Innovations in Quality, Effectiveness, and Safety (IQuESt), Michael E. DeBakey Veterans Affairs Medical Center and Baylor College of Medicine, Houston, Texas
4. Health Services Research Section, Department of Medicine, Baylor College of Medicine, Houston, Texas