1. Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
2. Clinical Microbiology and Virology Unit, Careggi University Hospital, Florence, Italy
3. Endocrinology and Metabolism, Santa Maria della Misericordia Hospital, Perugia, Italy
4. Medical Microbiology, Department of Medicine, University of Perugia, Perugia, Italy
5. Microbiology Unit, Santa Maria della Misericordia Hospital, Perugia, Italy