Department of Ophthalmology, University of Catania, Catania, Italy. Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Catania, Italy. Faculty of Medicine, University of Southampton, Southampton, UK. Department of Experimental Biomedicine and Clinical Neuroscience, Ophthalmology Section, University of Palermo, Palermo, Italy. Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy. Department of Ophthalmology, University of Bari, Bari, Italy. Department of Public Health, University of Naples Federico II, Naples, Italy. Department of Surgical Sciences, Eye Clinic Section, University of Turin, Turin, Italy.