1. Department of Ophthalmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
2. University Eye Clinic, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
3. Laboratory of Medical Microbiology and Virology, University Vita-Salute San Raffaele, 20132 Milan, Italy
4. Laboratory of Medical Microbiology and Virology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
5. Laboratory of Medical Microbiology and Virology, University of Insubria, 21100 Varese, Italy