1. Queen Mary's Hospital; Ophthalmology; Frognal Avenue Sidcup Kent UK DA14 6LT
2. University of Florence; Department of Translational Surgery and Medicine, Eye Clinic; Largo Brambilla, 3 Florence Italy 50134
3. Moorfields Eye Hospital/UCL Institute of Ophthalmology National Institute for Health Research Biomedical Research Centre; 162 City Road London UK EC1V 2PD