1. Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
2. IRCCS Centro Neurolesi Bonino-Pulejo, Messina, Italy
3. Department of Educational Sciences, University of Catania, Catania, Italy
4. Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, USA