1. Department of Experimental Biomedicine and Clinical Neurosciences, Section of Human Anatomy, University of Palermo, Palermo, Italy
2. Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
3. Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore; and IMET, Baltimore, MD, USA
4. Department of Therapeutic Research and Medicines Evaluation, National Institute of Health, Rome, Italy