1 Academic Ophthalmology and Vision Sciences, Division of Clinical Neurosciences, Eye and ENT Centre, Queen's Medical Centre, University of Nottingham, Nottingham, UK. winfried.amoaku@nottingham.ac.uk.
2 Ophthalmology, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK.
3 Eye Clinic, Bristol Eye Hospital, University Hospitals Bristol NHS Foundation Trust, Bristol, UK.
4 Eye Clinic, University Hospital Wales, Cardiff and Diabetic Eye Screening Wales, Public Health Wales, Cardiff, UK.
5 Ophthalmology Department, Leicester Royal Infirmary, Leicester, UK.
6 Hull and East Yorkshire Eye Hospital, Hull University Teaching Hospital, Hull, UK.
7 Eye Clinic, York Teaching Hospital NHS Foundation Trust, York, UK.
8 Medical Retina Services, Moorfields Eye Hospital NHS Foundation Trust, London, UK.
9 Leicester Diabetes Centre, Leicester General Hospital, University of Leicester, Gwendolen Road, Leicester, UK.
10 Western Eye Hospital, Marylebone, London, UK.
11 Ophthalmology, The Royal Hallamshire NHS Trust, Sheffield, UK.
12 Diabetes Centre, Imperial College Healthcare NHS Trust, London, UK.
13 Sunderland Eye Infirmary, South Tyneside and Sunderland NHS Foundation Trust, Sunderland, UK.
14 Ophthalmology, Royal Free London NHS Foundation Trust, London, UK.