1 Infectious Diseases Unit, Department of Clinical and Experimental Medicine, Azienda Ospedaliera Universitaria Pisana, University of Pisa, Pisa, Italy. vale.galfo@gmail.com.
2 Infectious Diseases Unit, Department of Clinical and Experimental Medicine, Azienda Ospedaliera Universitaria Pisana, University of Pisa, Pisa, Italy.
3 Microbiology Unit, Azienda Ospedaliera Universitaria Pisana, Pisa, Italy.