1. Department of Clinical and Experimental Medicine, Unit of Infectious Diseases, University of Messina, I-90124 Messina, Italy
2. Department of Pharmacological Sciences, University of Eastern Piedmont ‘A. Avogadro’, I-13100 Novara, Italy
3. Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, I-90124 Messina, Italy
4. Department of Clinical and Experimental Medicine, University of Catania, I-95123 Catania, Italy
5. Department of Pathology and Laboratory Medicine, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
6. Department of Biomedical and Biotechnological Sciences, Human Anatomy and Histology Section, University of Catania, I-95123 Catania, Italy
7. Department of Human Pathology of the Adult and the Developmental Age ‘G. Barresi’, Unit of Infectious Diseases, University of Messina, I-98122 Messina, Italy