1. Department of Global Health, Boston University School of Public Health, Boston, MA, USA.
2. Department of Research, Right to Care Zambia, Lusaka, Zambia.
3. Department of Health Behavior and Biological Sciences, School of Nursing, University of Michigan, Ann Arbor, MI, USA.
4. National Health Research Authority, Pediatric Centre of Excellence, Lusaka, Zambia.
5. Africare Zambia, Lusaka, Zambia.
6. Biostatistics and Epidemiology Data Analytics Center, Boston University School of Public Health, Boston, MA, USA.
7. Department of Global Health, School of Nursing and Health Professions, University of San Francisco, San Francisco, CA, USA.
8. Section of Infectious Diseases, Boston University School of Medicine, Boston, MA, USA.