1. UCL Institute of Ophthalmology, University College London, London, UK
2. Population, Policy and Practice Department of Research and Teaching, UCL GOS Institute of Child Health, London, UK
3. National Institute for Health Research Biomedical Research Centre, UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital, London, UK
4. Ophthalmology and Rheumatology Department, Great Ormond Street Hospital for Children NHS Trust, London, UK
5. Ulverscroft Vision Research Group, Institute of Child Health, University College London, London, UK
6. National Institute for Health Research Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK