Department of Ophthalmology, University of Catania, 95123, Catania, Italy. matteofallico@hotmail.com. Faculty of Medicine, University of Southampton, Southampton, UK. Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, 95123, Catania, Italy. Department of Ophthalmology, University of Catania, 95123, Catania, Italy. Department of Experimental Biomedicine and Clinical Neuroscience, Ophthalmology Section, University of Palermo, 90127, Palermo, Italy. Department of Surgical Sciences, Eye Clinic Section, University of Turin, 10122, Turin, Italy. Department of Ophthalmology, University Vita-Salute, IRCCS Ospedale San Raffaele, Milan, Italy. Department of Public Health, University of Naples Federico II, 80131, Naples, Italy. Department of Ophthalmology, University of Bari, 70124, Bari, Italy.