1. Institute for Medical Information Processing, Biometry and Epidemiology, Ludwig-Maximilians-University Munich, Germany
2. Mwanza Intervention Trials Unit, Mwanza, Tanzania
3. National Institute for Medical Research, Mwanza, Tanzania
4. Centre for Social Science Research, University of Cape Town, Cape Town, South Africa
5. Department for Social Policy and Intervention, University of Oxford, Oxford, UK
6. Centre for Rural Health, School of Nursing and Public Health, University of KwaZulu-Natal, South Africa
7. Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa
8. London School of Hygiene and Tropical Medicine, London, UK