1. Centre for Geographic Medicine and Research, Coast, Kenya Medical Research Institute, Kilifi, Kenya.
2. Innovations for Poverty Action, Lusaka, Zambia.
3. Department of Psychology and Global Health, University of Washington, Seattle, Washington.
4. Department of Behavioral and Social Sciences, School of Public Health, Brown University, Providence, Rhode Island.
5. Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom.
6. Departments of Medicine, Global Health, and Epidemiology, University of Washington, Seattle, Washington.