1. Massachusetts Eye and Ear Infirmary; Boston Massachusetts USA
2. Department of Ophthalmology; University of Verona-AOUI Verona; 37134 Verona Italy
3. Department of Ophthalmology; University of Colorado Anschutz Medical Campus; Aurora Colorado USA
4. UOC Oculistica; Fondazione Policlinico Universitario A.Gemelli IRCCS; Rome Italy
5. Department of Neurosciences, Psychology, Drug Research and Child Health (NEUROFARBA); University of Florence; Florence Italy
6. Centre for Public Health; Queen's University Belfast; Belfast UK