1. Department of Ophthalmology, Nottingham University Hospital, Nottingham, UK
2. Centre for Healthcare Randomised Trials (CHaRT), Health Services Research Unit, University of Aberdeen, Aberdeen, UK
3. Health Economics Group, Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, UK
4. Centre for Public Health, Queen’s University Belfast, Belfast, UK
5. School of Medicine, Medical and Biological Sciences, University of St Andrews, St Andrews, UK
6. Bristol Eye Hospital, University Hospitals Bristol NHS Foundation Trust, Bristol, UK
7. Institute of Ophthalmology, University College London, London, UK
8. Moorfields Eye Hospital NHS Foundation Trust, London, UK
9. Edinburgh Clinical Trials Unit, Usher Institute, University of Edinburgh, Edinburgh, UK