1. Southend University Hospital NHS Foundation Trust, Essex, UK
2. Anglia Ruskin University, Essex, UK
3. Department of Biomedical Science, Humanitas University, Milan, Italy
4. Singapore National Eye Center, Duke-NUS Medical School, Singapore
5. Shiley Eye Institute, Viterbi Family Department of Ophthalmology, University of California San Diego, La Jolla, CA, USA