1. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
2. Reproductive, Maternal, Newborn, and Child Health, FHI 360, Durham, NC, USA
3. Zambia Country Office, FHI 360, Lusaka, Zambia
4. Arthur Davison Children’s Hospital, Ndola, Zambia
5. Biostatistics, FHI 360, Durham, NC, USA