1. National University Health System; Department of Ophthalmology; 1E Kent Ridge Rd, Singapore 119228 Singapore Singapore
2. Royal Melbourne Hospital; Department of Ophthalmology; 300 Grattan Street, Parkville Melbourne Victoria Australia 3050
3. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision, ICEH; Keppel Street London UK WC1E 7HT
4. Kings College London; Department of Primary Care & Public Health Sciences; 4th Floor, Addison House Guy's Campus London UK SE1 1UL
5. NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology; Research and Development Department; 162 City Road London UK EC1V 2PD