1. School of Economics and DataFirst, University of Cape Town, Cape Town, South Africa
2. MRC/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
3. INDEPTH Network, Accra, Ghana
4. DST/SAMRC South African Population Research Infrastructure Network (SAPRIN), Johannesburg, South Africa