1. Department of Pediatrics, Phramongkutklao Hospital School of Medicine, Bangkok, Thailand.
2. U.S. Component, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand.
3. Royal Thai Army Component, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand.
4. Rayong Provincial Health Office, Rayong, Thailand.
5. Sattahip Kilo 10 District Hospital, Chon Buri, Thailand.
6. US Military HIV Research Program, Rockville, Maryland 20850.