1. Department of Ophthalmology, University of Bonn, Bonn, Germany
2. Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom
3. University College London, Institute of Ophthalmology, London, United Kingdom
4. Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, and Nuffield Laboratory of Ophthalmology, Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom