1. Tigray Regional Health Bureau, Mekele, Tigray, Ethiopia
2. Department of Ophthalmology, Addis Ababa University, Addis Ababa, Ethiopia
3. Clinical Research Department, London School of Hygiene & Tropical Medicine, London, UK
4. Sightsavers, Haywards Heath, UK
5. Michael Dejene Public Health Consultancy Services, Addis Ababa, Ethiopia
6. Light for the World, Addis Ababa, Ethiopia
7. Task Force for Global Health, Decatur, GA, USA