1. Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts.
2. Jos University Teaching Hospital, Jos, Nigeria.
3. Nigerian Institute of Medical Research, Lagos, Nigeria.
4. University College Hospital, Ibadan, Nigeria.
5. Brigham and Women's Hospital, Boston, Massachusetts.
6. AIDS Prevention Initiative Nigeria, Ltd./Gte., Abuja, Nigeria.