1. Department of Ophthalmology; The Royal United Hospitals Bath; Bath UK
2. Manchester Royal Eye Hospital; Manchester UK
3. King's College London; London UK
4. Department of Ophthalmology, New Zealand National Eye Centre; University of Auckland; Auckland New Zealand
5. Population Health Sciences Institute; Newcastle University; Newcastle upon Tyne UK
6. ICEH (International Centre for Eye Health); London School of Hygiene & Tropical Medicine; London UK