1. Santo Spirito Hospital, Casale Monferrato, Italy
2. Centre for Macular Research, San Mauro Torinese, Italy
3. University of Verona, Verona, Italy
4. Cà Foncello Hospital, Treviso, Italy
5. Microbiological Laboratory, Turin Eye Hospital, Turin, Italy
6. Scientific Institute San Raffaele, University Vita-Salute, Milan, Italy
7. Department of Public Health and Pediatrics, University of Turin, Turin, Italy
8. Consiglio Superiore di Sanità, Rome, Italy