1 Department of Experimental and Clinical Medicine, Infectious and Tropical Diseases Unit, University of Florence, Careggi University and Hospital, Florence, Italy.
2 Department of Infectious-Tropical Diseases and Microbiology, I. R. C. C. S, Sacro Cuore Don Calabria Hospital, Negrar Di Valpolicella, Verona, Italy.
3 School of Human Health Sciences, Degree Course in Medicine and Surgery, University of Florence, Florence, Italy.
4 Department of Experimental and Clinical Medicine, Infectious and Tropical Diseases Unit, University of Florence, Careggi University and Hospital, Florence, Italy. lorenzo.zammarchi@unifi.it.