[1] Kenya Govt Med Res Ctr, Walter Reed Project, Kisumu, Kenya
[2] Walter Reed Army Inst Res, US Mil HIV Res Program, Silver Spring, MD USA
[3] Walter Reed Program, Abuja, Nigeria
[4] Mbeya Med Res Ctr, Mbeya, Tanzania
[5] Makerere Univ, Walter Reed Project, Kampala, Uganda
[6] Kenya Govt Med Res Ctr, Walter Reed Project, Kericho, Kenya