1. Khmer-Soviet Friendship Hospital, Phnom Penh, Cambodia
2. Preah Ang Doung Hospital, Phnom Penh, Cambodia
3. Task Force for Global Health, Atlanta, GA, USA
4. Clinical Research Department, London School of Hygiene & Tropical Medicine, London, UK
5. Michael Dejene Public Health Consultancy Services, Addis Ababa, Ethiopia
6. Kilimanjaro Centre for Community Ophthalmology International, Cape Town, South Africa