1. Department of Medicine, Surgery, and Pharmacy, University of Sassari, Sassari, Italy
2. Ophthalmology Unit, Azienda Ospedaliero Universitaria di Sassari, Sassari, Italy
3. Microbiology and Virology Unit, Azienda Ospedaliero Universitaria di Sassari, Sassari, Italy
4. Department of Biomedical Sciences, University of Sassari, Sassari, Italy
5. Eye Clinic Section, Department of Surgical Sciences, University of Turin, Turin, Italy