1. Department of Economics, Barnard College, Columbia University, New York, USA.
2. Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom.
3. Centre for Health Research, Kenya Medical Research Institute, Kisumu, Kenya.
4. County Health Headquarters, Ministry of Health, Siaya County, Kenya.
5. Division of Global Health Protection, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
6. Centre for Health Economics and Medicines Evaluations, Bangor University, Bangor, United Kingdom.