1 Ophthalmology Clinic, University "G. d'Annunzio" of Chieti-Pescara, 66100 Chieti, Italy.
2 University of Molise, 86100 Campobasso, Italy.
3 Ophthalmology Section, Department of Medicine, Surgery and Neuroscience, University of Siena, 53100 Siena, Italy.
4 Department of Ophthalmology, University Paris Est Creteil, Centre Hospitalier Intercommunal de Creteil, 94010 Creteil, France; Department of Ophthalmology, University Vita-Salute, IRCCS Ospedale San Raffaele, Via Olgettina, 60 20132 Milan, Italy.
5 Department of Ophthalmology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
6 Department of Ophthalmology III, Quinze-Vingts National Ophthalmology Hospital, 75012 Paris, France.