1. Unit of Infectious and Tropical Diseases , Department of Clinical and Experimental Sciences, , Brescia 25123 , Italy
2. University of Brescia and ASST ‘Spedali Civili di Brescia , Department of Clinical and Experimental Sciences, , Brescia 25123 , Italy
3. Department of Infectious and Tropical Diseases, Careggi University Hospital , Florence 50134 , Italy
4. Department of Infectious Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria hospital , Via Sempreboni 5, 37024 Negrar, Verona , Italy