1. Division of Infectious Diseases, Department of Medicine, University of Missouri, Columbia, Missouri, USA.
2. Department of Management, Policy, and Community Health, School of Public Health, The University of Texas, Health Science Center at Houston, Houston, Texas, USA.
3. Section of Infectious Diseases, Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
4. VA Center for Innovations in Quality, Effectiveness, and Safety, Houston, Texas, USA.
5. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA.
6. School of Medicine, Baylor College of Medicine, Houston, Texas, USA.
7. Department of Public Health, University of Missouri, Columbia, Missouri, USA.