1. Faculty of Life and Health Sciences, University of Ulster, Coleraine, Northern Ireland,
2. School of Life and Health Sciences, Ophthalmic Research Group, Aston University, Birmingham, United Kingdom,
3. Centre for Public Health, Queens University, Belfast, Northern Ireland,
4. National Vision Research Institute, Australian College of Optometry, Carlton, Australia,
5. Department of Ophthalmology, Royal Victoria Hospital/Queens University, Belfast, Northern Ireland,