Department of Ophthalmology, University of Catania, Catania, Italy. Eye Unit, Southampton University Hospital, Southampton, UK. Department of Ophthalmology, University of Bari, Bari, Italy. Ophthalmology Unit, Bussolengo Hospital, Bussolengo, Verona, Italy. Department of Ophthalmology, University of "Magna Graecia", Catanzaro, Italy. Department of Ophthalmology, University Vita-Salute Hospital San Raffaele, Milano, Italy. Department of Public Health, University of Naples Federico II, Naples, Italy. Department of Experimental Biomedicine and Clinical Neuroscience, Ophthalmology Section, University of Palermo, Palermo, Italy. Division of Ophthalmology, Department of Surgery and Biomedical Science, S Maria della Misericordia Hospital, University of Perugia, Perugia, Italy. Department of Ophthalmology, IRCCS - Fondazione Bietti, Rome, Italy. Department of Ophthalmology, University of Sassari, Sassari, Italy. Department of Surgical Science, Eye Clinic, University of Torino, Torino, Italy. Department of Ophthalmology, Fondation Ophtalmologique A. De Rothschild, Paris, France.