1. Department of Experimental and Clinical Medicine, University of Florence , Florence , Italy
2. Referral Centre for Tropical Diseases of Tuscany, Infectious and Tropical Diseases Unit, Careggi University Hospital , Florence , Italy
3. Department of Infectious—Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital , Negrar, Verona , Italy
4. Department of Health Sciences, University of Florence , Florence , Italy