1. National Institute of Health Research Biomedical Research Centre (BRC), Moorfields Eye Hospital National Health Service (NHS) Foundation Trust, UCL Institute of Ophthalmology, London, England
2. Moorfields Eye Hospital NHS Foundation Trust, London, England
3. UCL Institute of Ophthalmology, London, England
4. Pragmatic Clinical Trial Unit, Queen Mary University of London, London, England
5. Blizard Institute, Barts and The London School of Medicine and Dentistry, London, England
6. Gartnavel Royal Hospital, Glasgow, Scotland
7. St Thomas' Hospital, London, England
8. Department of Primary Care and Public Health Sciences, King’s College London, London, England