Indiana University, Indiana University, Indiana University, University of the Witwatersrand - MRC/Wits Rural Public Health and Health Transitions Research Unit, University of the Witwatersrand - MRC/Wits Rural Public Health and Health Transitions Research Unit, Harvard University - Center for Population and Development Studies, Harvard University - Center for Population and Development Studies, University of the Witwatersrand - MRC/Wits Rural Public Health and Health Transitions Research Unit, University of the Witwatersrand - South African Medical Research Council and University of Michigan at Ann Arbor

University of the Witwatersrand - South African Medical Research Council, University of the Witwatersrand - South African Medical Research Council, University of the Witwatersrand - MRC/Wits Rural Public Health and Health Transitions Research Unit, University of the Witwatersrand - School of Clinical Medicine, African Population and Health Research Center (APHRC), African Population and Health Research Center (APHRC), University of Limpopo, University of Limpopo, Australian National University (ANU), University of the Witwatersrand - South African Medical Research Council, affiliation not provided to SSRN, University of the Witwatersrand - South African Medical Research Council, University of the Witwatersrand - South African Medical Research Council, University of the Witwatersrand - South African Medical Research Council and University of the Witwatersrand - MRC/Wits Rural Public Health and Health Transitions Research Unit