1. Department of Global Health, Boston University School of Public Health, Boston, Massachusetts;
2. Right to Care Zambia, Lusaka, Zambia;
3. Section of Infectious Diseases, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts;
4. National Emerging Infectious Diseases Laboratory, Boston University, Boston, Massachusetts;
5. Center for Emerging Infectious Diseases Policy and Research, Boston University, Boston, Massachusetts;
6. Household Economics and Health Systems Research Unit, Swiss Tropical and Public Health Institute, Basel, Switzerland;
7. National Health Research Authority Pediatric Centre of Excellence, Lusaka, Zambia