1. Clinical Research Center, HJF Medical Research International, Abuja, Nigeria.
2. U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA.
3. Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, USA.
4. Infectious Disease Unit, Niger Delta University Teaching Hospital, Okolobiri, Nigeria.
5. Institute of Global Health, University College London (UCL), London, United Kingdom.