1. Norfolk and Norwich University Hospital; Colney Lane Norwich UK NR4 7UY
2. Moorfields Eye Hospital NHS Foundation Trust; London UK EC1V 2PD
3. Moorfields Eye Hospital NHS Foundation Trust; Research and Development Department; City Road London UK EC1V 2PD
4. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision Group, ICEH; Keppel Street London UK WC1E 7HT