1. Division of Infectious Diseases, Emory University School of Medicine , Atlanta , Georgia , USA
2. Nebraska Department of Health and Human Services , Lincoln, Nebraska , USA
3. Department of Medicine, University of Arizona College of Medicine , Tucson, Arizona , USA
4. Visual Medical Education, Emory University School of Medicine , Atlanta , Georgia , USA
5. Infectious Diseases Section, Department of Medicine, Baylor College of Medicine , Houston, Texas , USA
6. Medical Care Line, Michael E. DeBakey Veterans Affairs Medical Center , Houston, Texas , USA