1. Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Genoa, Italy
2. Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
3. Microbiology and Virology Unit, Careggi University Hospital, Florence, Italy
4. Laboratory of Bacteriology, Hellenic Pasteur Institute, Athens, Greece
5. Department of Biology, University of Rome Tor Vergata, Rome, Italy