1. Department of Psychiatry, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
2. Department of Epidemiology, Harvard T. H. Chan School of Public Health, Cambridge, MA, USA
3. Division of Epidemiology and Biostatistics, School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
4. Statistical Section, MRC/UVRI Uganda Research Unit on AIDS, Entebbe, Uganda
5. Department of Psychiatry, Makerere University, Kampala, Uganda
6. Mental Health Project, MRC/LSHTM/UVRI and Senior Wellcome Trust Fellow, Uganda