1. Retinoblastoma Genetic Screening Unit, Barts Health NHS Trust, London, UK
2. Department of Pathology, Barts Health NHS Trust, London, UK
3. Retinoblastoma Service, Royal London Hospital, Barts Health NHS Trust, London, UK
4. NIHR Biomedical Research Centre for Ophthalmology, Moorfields Eye Hospital and UCL Institute of Ophthalmology, London, UK