1. HIV/AIDS and Retrovirology Branch, Division of AIDS, STD, and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333
2. HIV/AIDS Collaboration, Nonthaburi, 11000 Thailand
3. HIV/AIDS Collaboration, Nonthaburi, 11000 Thailand; Division of HIV/AIDS Prevention, Surveillance and Epidemiology, National Center for HIV, STP, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA 30333
4. HIV Immunology and Diagnostics Branch, Division of AIDS, STD, and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333