1. From the National Biomedical Research Centre for Ophthalmology, Moorfields Eye Hospital, and Division of Genetics and Epidemiology, UCL Institute of Ophthalmology, London, United Kingdom;
2. the Department of Ophthalmology, Norfolk and Norwich University Hospital, Norwich, United Kingdom;
3. the Department of Public Health and Primary Care, Institute of Public Health, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom; and
4. the MRC (Medical Research Council) Epidemiology Unit, Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, United Kingdom.