1. City, University of London, Optometry and Visual Sciences, London, UK
2. NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK
3. Centre for Public Health, Queen's University Belfast, ICSA, Royal Victoria Hospital, Belfast, Northern Ireland, UK
4. Department of Health Sciences, University of Eastern Piedmont “A. Avogadro,” Novara, Italy
5. Ophthalmology Unit, University Hospital Maggiore della Carità, Novara, Italy