1. Division of HIV/AIDS Prevention, National Center for HIV/AIDS, Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia.
2. Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland.
3. Nigerian Federal Ministry of Health, Abuja, Nigeria.
4. Division of Global HIV/AIDS, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia.