1. Bureau of Epidemiology, Office of Surveillance and Public Health Preparedness, Houston Department of Health and Human Services, Houston, TX, USA
2. Department of Internal Medicine, Division of Infectious Diseases, University of Texas Health Science Center–Houston, Houston, TX, USA
3. Department of Medicine, Infectious Diseases Section, Michael E. DeBakey VA Medical Center, Baylor College of Medicine, Houston, TX, USA
4. Centers for Disease Control and Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Division of HIV/AIDS Prevention, Atlanta, GA, USA
5. Institute of Community Health, Texas Medical Center, University of Houston College of Pharmacy, Houston, TX, USA