1. Department of Social Policy and Intervention, University of Oxford, Oxford, UK
2. School of Social and Political Science, University of Edinburgh, Edinburgh, UK
3. Optentia, Faculty of Health Sciences, North-West University, Vanderbijlpark, South Africa
4. Institute for Global Health, University College London, London, UK
5. Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK
6. Department of Sociology, University of Cape Town, Cape Town, South Africa
7. Centre for Social Science Research, University of Cape Town, Cape Town, South Africa
8. Department of Psychiatry, University of Cape Town, Cape Town, South Africa