1. Ophthalmology; Fondazione G.B. Bietti per lo studio e la ricerca in Oftalmolologia-IRCCS; Rome Italy
2. Department of Clinical and Experimental Medicine; University of Pisa; Pisa Italy
3. Health Services Research Unit; University of Aberdeen; Aberdeen UK
4. Azienda Ospedaliero Universitaria Careggi; Florence Italy
5. Department of Ophthalmology, School of Medicine; University of Colorado; Aurora CO USA
6. Department of Neurosciences, Psychology, Drug Research and Child Health (NEUROFARBA); University of Florence; Florence Italy