1. Ophthalmology Clinic, Department of Medicine and Aging Science, University G. d'Annunzio of Chieti-Pescara, Chieti, Italy
2. Eye Clinic, San Salvatore Hospital, University of L'Aquila, L'Aquila, Italy
3. Health Department of Abruzzo, Pescara, Italy
4. Institute of Ophthalmology, University of Modena and Reggio Emilia, Modena, Italy