1. Genetics Service Moorfields Eye Hospital London UK
2. UCL Institute of Ophthalmology London UK
3. Ophthalmic Genetics and Visual Function branch National Eye Institute, National Institutes of Health Bethesda Maryland USA
4. Department of Electrophysiology Moorfields Eye Hospital London UK
5. North Thames Genomic Laboratory Hub Great Ormond Street NHS Foundation Trust London UK
6. Blueprint Genetics Espoo Finland
7. Section of Ophthalmology King's College London London UK
8. Enzyme Unit, Chemical Pathology, Paediatric Laboratory Medicine Great Ormond Street Hospital for Children NHS Foundation Trust London UK