1. Children's Health Services Research, Department of Pediatrics, Indiana University School of Medicine Indianapolis, IN, USA
2. Academic Model Providing Access to Healthcare (AMPATH), Eldoret, Kenya
3. Regenstrief Institute, Inc., Indianapolis, IN, USA
4. Department of Child Health and Paediatrics, Moi University School of Medicine, Eldoret, Kenya
5. Department of Biostatistics, Indiana University School of Medicine Indianapolis, IN, USA
6. Department of Medicine, Indiana University School of Medicine Indianapolis, IN, USA