1. Prevention of Blindness Program, Ministry of Public Health & Population, Sana’a, Yemen
2. Department of Ophthalmology, College of Medicine, University of Sana’a, Sana’a, Yemen
3. Eye Unit, Kuwait University Teaching Hospital, Sana’a, Yemen
4. Eye Unit, Al-Thawra Hospital, Sana’a, Yemen
5. World Health Organization Country Office, Sana’a, Yemen
6. Ministry of Public Health & Population, Sana’a, Yemen
7. Task Force for Global Health, Atlanta, GA, USA
8. Kilimanjaro Centre for Community Ophthalmology, Division of Ophthalmology, University of Cape Town, Cape Town, South Africa
9. Clinical Research Department, London School of Hygiene & Tropical Medicine, London, UK
10. London Centre for Neglected Tropical Diseases Research, London, UK
11. Department of Control of Neglected Tropical Diseases, World Health Organization, Geneva, Switzerland