1 University of Colorado Boulder, USA ; MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, University of Witwatersrand, South Africa.
2 University of Colorado Boulder, USA.
3 MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, University of Witwatersrand, South Africa.
4 MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, University of Witwatersrand, South Africa ; Umeå Centre for Global Health Research, Umeå University, Umeå, Sweden ; INDEPTH Network, Ghana.