1. Division of Infectious Diseases, Department of Medicine, University of Missouri, Columbia, MO, USA
2. Section of Infectious Diseases, Department of Medicine, Baylor College of Medicine, Houston, TX, USA
3. VA Center for Innovations in Quality, Effectiveness and Safety, Houston, TX, USA
4. Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX, USA
5. School of Medicine, Baylor College of Medicine, Houston, TX, USA
6. Division of Infectious Diseases, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA