Abstract
This work is based on research supported by the National Research Foundation (ESRC-NRF International Centre Partnership, Ref ICPC150423117553). Any opinion, finding and conclusion or recommendation expressed in this material is that of the author(s) and the NRF does not accept any liability in this regard. We acknowledge the invaluable data and unreserved support of the Medical Research Council/ University of the Witwatersrand Rural Public Health and Health Transitions Research Unit (Agincourt), and the engaged communities in which the research has taken place. Funding is gratefully acknowledged from Economic Research Southern African (scholarship to T.Harris), the SARChI chair in Poverty and Inequality Research (scholarship to T. Harris), the University of the Witwatersrand; South African Medical Research Council and National Research Foundation; the Wellcome Trust, UK, (Grants 058893/Z/99/A; 069683/Z/02/Z; 085477/Z/08/Z), The William and Flora Hewlett Foundation, National Institute on Aging (NIA) of the NIH, and The Andrew W Mellon Foundation, USA.
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