1. Institute of Ophthalmology, University College London, London EC1V 9EL, United Kingdom
2. Department of Ophthalmology, King’s College London, London SE1 7EH, United Kingdom
3. Department of Twin Research and Genetic Epidemiology, King’s College London, London SE1 7EH, United Kingdom
4. Medical Retina Service, Moorfields Eye Hospital, London EC1V 2PD, United Kingdom
5. Inherited Eye Disease Service, Moorfields Eye Hospital, London EC1V 2PD, United Kingdom