1. Department of Ophthalmology, University of Malawi, College of Medicine, Blantyre, Malawi
2. Blantyre Institute for Community Ophthalmology, Lions Sight First Eye Hospital, Blantyre, Malawi
3. Ministry of Health, Lilongwe, Malawi
4. International Trachoma Initiative, Task Force for Global Health, Decatur, GA, USA
5. Clinical Research Department, London School of Hygiene & Tropical Medicine, London, UK
6. Department of Control of Neglected Tropical Diseases, World Health Organization, Geneva, Switzerland