1. UCL Institute of Ophthalmology, University College London, London, United Kingdom
2. Moorfields Eye Hospital NHS Foundation Trust, City Road, London, United Kingdom
3. Cambridge Research Systems Ltd., Kent, United Kingdom
4. First Division of Ophthalmology, National and Kapodistrian University of Athens, General Hospital of Athens, Athens, Greece
5. Department of Ophthalmology, Stanford University, Palo Alto, California, United States
6. Department of Ophthalmology & Visual Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin, United States