1. The Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
2. The Western Eye Hospital, Imperial College Healthcare NHS Trust, London, UK
3. The Imperial College Ophthalmic Research Group (ICORG), Imperial College London, London, UK
4. Department of Ophthalmology, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
5. Glaucoma and Retinal Neurodegeneration Group, Department of Visual Neuroscience, UCL Institute of Ophthalmology, London, UK