1. School of Economics and Finance, University of the Witwatersrand , 1 Jan Smuts Avenue, Braamfontein, Johannesburg, Gauteng 2000, South Africa
2. Centre for Rural Health, University of KwaZulu-Natal , 238 Masizi Kunene Road, Durban, KwaZulu-Natal 4041, South Africa
3. Department of Social Policy and Intervention, University of Oxford , 32 Wellington Square, Oxford OX1 2ER, United Kingdom
4. Centre for Social Science Research, University of Cape Town , Robert Leslie Social Science Building 12 University Avenue South, University of Rondebosch, Cape Town 7700, South Africa
5. Health Psychology Unit, Institute of Global Health, University College London , Rowland Hill Street, London NW3 2PF, United Kingdom
6. UK Department of Psychiatry and Mental Health, University of Cape Town , Anzio Road, 1st floor, Neuroscience Institute, Groote Schuur Hospital, Observatory, Cape Town, Western Cape 7925, South Africa