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. Ruharo Eye Centre, Ruharo Mission Hospital, Mbarara, Uganda
5. Department of Epidemiology, Uganda Virus Research Institute, Entebbe, Uganda
6. Tropical Epidemiology Group, London School of Hygiene & Tropical Medicine, London, UK