Affiliations

• ¹ UCL Institute of Ophthalmology, University College London, London, UK; Moorfields Eye Hospital, London, UK.
• ² Department of Haematology, University of Cambridge and, NHS Blood and Transplant, Cambridge, UK; NIHR BioResource-Rare Diseases, Cambridge.
• ³ UCL Institute of Ophthalmology, University College London, London, UK; Moorfields Eye Hospital, London, UK; Ophthalmology Department, UCSF School of Medicine, Koret Vision Centre, San Francisco CA.
• ⁴ NIHR BioResource-Rare Diseases, Cambridge; Department of Medical Genetics, Cambridge Institute for Medical Research, University of Cambridge, Cambridge, UK.
• ⁵ UCL Institute of Ophthalmology, University College London, London, UK; Moorfields Eye Hospital, London, UK. Electronic address: graham.holder@moorfields.nhs.uk.