1. Department of Psychiatry University of Oxford Oxford UK
2. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences University of Witwatersrand Johannesburg South Africa
3. Department of Experimental Psychology University of Oxford Oxford UK
4. Centre for Global Health Research Umeå, University Umeå Sweden
5. Department of Epidemiology, Carolina Population Centre University of North Carolina Chapel Hill NC USA
6. Wits Reproductive Health and HIV Institute, University of the Witwatersrand Johannesburg South Africa
7. INDEPTH Network Accra Ghana