1. Department of Ophthalmology, University of Nairobi, Nairobi, Kenya
2. Ophthalmic Services Unit, Ministry of Health, Nairobi, Kenya
3. Neglected Tropical Diseases Unit, Ministry of Health, Nairobi, Kenya
4. Kenya National Bureau of Statistics, Ministry of Planning, Nairobi, Kenya
5. Clinical Research Department, London School of Hygiene & Tropical Medicine, London, UK
6. RTI International, Atlanta, GA, USA
7. Task Force for Global Health, Atlanta, GA, USA
8. Department of Control of Neglected Tropical Diseases, World Health Organization, Geneva, Switzerland