1. Division of AIDS, STD, TB Laboratory Research, and Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia 30333
2. Bangkok Metropolitan Administration, Bangkok, Thailand
3. HIV/AIDS Collaboration, Bangkok, Thailand
4. Division of AIDS, STD, TB Laboratory Research, and Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia 30333 and HIV/AIDS Collaboration, Bangkok, Thailand