1. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision, ICEH; Keppel Street London UK WC1E 7HT
2. University of Florence; Department of Translational Surgery and Medicine, Eye Clinic; Largo Brambilla, 3 Florence Italy 50134
3. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision Group, 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. Queen's University Belfast; Centre for Vision and Vascular Science; Belfast Northern Ireland UK BT12 6BA
6. Moorfields Eye Hospital NHS Foundation Trust; City Road London UK EC1V 2PD
7. London School of Hygiene & Tropical Medicine; Epidemiology Unit; Keppel Street London UK WC1E 7HT