1. Medical Retina Service, Moorfields Eye Hospital, London, UK
2. University College London Institute of Ophthalmology, London, UK
3. St. James's University Hospital, Leeds, UK
4. Department of Ophthalmology, Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK
5. Jacobs Retina Center, Shiley Eye Institute, University of California San Diego, La Jolla, CA, USA
6. Shiley Eye Institute, University of California San Diego, La Jolla, CA, USA
7. Department of Ophthalmology, University of California San Francisco, San Francisco, CA, USA