1. Department of Pediatrics; Vanderbilt University Children's Hospital; Nashville Tennessee
2. Department of Human Pathology; University of Nairobi; Nairobi Kenya
3. Department of Haematology and Blood Transfusion; University of Nairobi; Nairobi Kenya
4. Department of Surgery; Kenyatta National Hospital; Nairobi Kenya
5. USAID-Ampath Partnership; Moi Teaching and Referral Hospital; Eldoret Kenya
6. Department of Immunology; Moi Teaching and Referral Hospital; Eldoret Kenya
7. Vanderbilt Epidemiology Center; Vanderbilt Institute for Medicine and Public Health; Nashville Tennessee
8. Department of Pediatric Surgery; Vanderbilt University Children's Hospital; Nashville Tennessee
9. Department of Biostatistics; Vanderbilt University Children's Hospital; Nashville Tennessee