1. 1Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy;
2. 2Infectious and Tropical Diseases Unit, Careggi University Hospital, Florence, Italy;
3. 3Clinic of Infectious Diseases, Vita-Salute San Raffaele University, Milan, Italy;
4. 4Referral Center for Tropical Diseases of Tuscany, Infectious and Tropical Diseases Unit, Careggi University Hospital, Florence, Italy