1. International Centre for Eye Health, London School of Hygiene & Tropical Medicine, London, UK
2. Department of Ophthalmology, Mbarara University of Science and Technology, Mbarara, Uganda
3. Department of Ophthalmology, University of Nairobi, Nairobi, Kenya
4. Department of Ophthalmology, Uganda Virus Research Institute, Entebbe, Uganda
5. Tropical Epidemiology Group, London School of Hygiene & Tropical Medicine, London, UK