1. Department of Clinical and Experimental Medicine, University of Catania, 95123 Catania, Italy
2. Department of Biomedical and Biotechnological Sciences, University of Catania, 95123 Catania, Italy
3. Unit of Infectious Diseases, Department of Clinical and Experimental Medicine, University of Messina, 98124 Messina, Italy
4. U.O.C. Laboratory Analysis Unit, A.O.U. “Policlinico-Vittorio Emanuele”, Via S. Sofia 78, 95123 Catania, Italy
5. Unit of Infectious Diseases, ARNAS Garibaldi Hospital, University of Catania, 95122 Catania, Italy
6. Department of Diagnostic and Public Health, Section of Pathology, University of Verona, 37124 Verona, Italy
7. Intensive Care Unit, ARNAS Garibaldi Hospital, 95122 Catania, Italy