1. Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland
2. University of Basel, Basel, Switzerland
3. Health Systems, Impact Evaluation, and Policy, Ifakara Health Institute, Dar-es-Salaam, Tanzania
4. Kenya Medical Research Programme-Wellcome Trust Collaborative Programme, Kilifi, Kenya
5. Department of Psychiatry, University of Oxford, Oxford, UK