1. Department of Psychiatry, University of Oxford, Oxford, United Kingdom
2. School of Social and Community Medicine, University of Bristol, Oakfield House, Bristol, United Kingdom
3. School of Psychology and Clinical Language Sciences, University of Reading, Reading, United Kingdom
4. Department of Psychology, Stellenbosch University, Matieland, Stellenbosch, South Africa
5. Department of Psychology, University of Cape Town, Rondebosch, Cape Town, South Africa
6. Department of Psychology, University of California, Los Angeles
7. Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles
8. Medical Research Council/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa