1. Department of Health Policy, Vanderbilt University Medical Center, Nashville, USA
2. Department of Biostatistics, Vanderbilt University Medical Center, Nashville, USA
3. Institute for Global Health, Vanderbilt University Medical Center, Nashville, USA
4. Friends in Global Health, Impact and Project Evaluation Department, Quelimane, Mozambique
5. Department of Pediatrics, Vanderbilt University, Nashville, USA