1. Microbiology Section, Department of Experimental Medicine and Biochemical Sciences, University of Perugia, 06122 Perugia, Italy
2. Anatomy Section, Department of Experimental Medicine and Biochemical Sciences, University of Perugia, 06122 Perugia, Italy
3. Department of Biotechnology and Bioscience, University of Milano-Bicocca, 20126 Milano, Italy