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 Microbiology, Mbarara University of Science and Technology, Mbarara, Uganda
4. Ruharo Eye Centre, Ruharo Mission Hospital, Mbarara, Uganda
5. Department of epidemiology, Uganda Virus Research Institute, Entebbe, Uganda
6. Department of Ophthalmology, University of Nairobi, Nairobi, Kenya
7. Tropical Epidemiology Group, London School of Hygiene & Tropical Medicine, London, UK