1. Department of Biomedical and Biotechnological Sciences, University of Catania, I‑95123 Catania, Italy
2. Department of Clinical and Experimental Medicine, Unit of Infectious Diseases, ARNAS Garibaldi Hospital, University of Catania, I‑95123 Catania, Italy
3. Department of Clinical and Experimental Medicine, Unit of Infectious Diseases, University of Messina, I‑98122 Messina, Italy