1. Academic Model Providing Access to Healthcare (AMPATH), Eldoret, Kenya
2. Child Health and Paediatrics, College of Health Sciences, Moi University, Eldoret, Kenya
3. Department of Epidemiology, Johns Hopkins University, Baltimore, USA
4. USAID–AMPTH Partnership, Eldoret, Kenya
5. Department of Epidemiology, University of Toronto, Ontario, Canada