1. Royal Victoria Hospital; Ophthalmology Department; Grosvenor Road Belfast UK BT12 6BA
2. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision, ICEH; Keppel Street London UK WC1E 7HT
3. Queen's University; Wellcome-Wolfson Institute for Experimental Medicine; Belfast UK
4. Queen's University Belfast; Centre for Public Health; Belfast UK BT12 6BA