1. Department of Surgical, Medical, Molecular Pathology and Critical Area, University of Pisa, Pisa, Italy.
2. Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy.
3. Department of Forensic Medicine, Azienda USL Toscana Nordovest, Lucca, Italy.
4. Global Virus Network, University of Insubria, Varese, Italy.