1. The Moorfields Eye Hospital/UCL Institute of Ophthalmology National Institute for Health Research Biomedical Research Centre; 162 City Road London UK EC1V 2PD
2. Moorfields Eye Hospital NHS Foundation Trust; External Disease Service; 162 City Road London UK EC1V 2PD
3. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision Group, ICEH; Keppel Street London UK WC1E 7HT