1. Department of Biomedical and Biotechnological Sciences, Section of Microbiology, University of Catania, Catania, Italy
2. Department of Clinical and Experimental Medicine, Unit of Math and Comp Science, University of Catania, Catania, Italy
3. Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
4. Department of Clinical and Experimental Medicine, Unit of Infectious Diseases, ARNAS Garibaldi Hospital, University of Catania, Catania, Italy