1. Department of Retrovirology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand.
2. Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
3. National Blood Centre, Thai Red Cross Society, Bangkok, Thailand.
4. Thai Red Cross AIDS Research Centre, Bangkok, Thailand.
5. U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Rockville, Maryland.
6. Department of Pathology, Walter Reed National Military Medical Center, Bethesda, Maryland.
7. Department of Infectious Diseases, Walter Reed National Military Medical Center, Bethesda, Maryland.