1. Macular Unit, Fairview 2, Mater Hospital; Ophthalmology Department; Crumlin Road Belfast UK BT14 6AB
2. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision, ICEH; Keppel Street London UK WC1E 7HT
3. Royal Victoria Hospital; Ophthalmology Department; Belfast UK
4. Queen's University Belfast; Centre for Experimental Medicine; Grosvenor Road Belfast UK BT12 6BA