1. Emerging Infectious Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
2. Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland, USA
3. U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
4. Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
5. Integral Molecular, Philadelphia, Pennsylvania, USA
6. Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
7. Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA