1. Armed Forces Research Institute of Medical Sciences, Department of Retrovirology, Bangkok, Thailand
2. Henry M Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, United States
3. Walter Reed Army Institute of Research, U.S. Military HIV Research Program, Silver Spring, MD, United States
4. Mahidol University, Faculty of Tropical Medicine, Bangkok, Thailand
5. Ministry of Public Health, Department of Disease Control, Nonthaburi, Thailand
6. Cooper Human Systems, Nashua, NH, United States
7. National Institute of Infectious Diseases, AIDS Research Center, Tokyo, Japan