1. Department of Ophthalmology, National Relevance and High Specialization Hospital Trust ARNAS Civico, Di Cristina Benfratelli, 90127 Palermo, Italy
2. Department of Ophthalmology, Villa Sofia Cervello Hospital Palermo, 90146 Palermo, Italy
3. Azienda Sanitaria Provinciale Palermo, 90141 Palermo, Italy
4. Department of Ophthalmology, Azienda Sanitaria Provinciale Trapani, 91100 Trapani, Italy