1. Immunosenescence Unit, Department of Pathobiology and Biomedical Methodologies, University of Palermo, Palermo, Italy.
2. IBIM, National Research Council, Palermo, Italy.
3. Dipartimento di Biotecnologie Mediche e Medicina Legale, University of Palermo, Palermo, Italy.
4. Department of Health Sciences, University of Molise, Campobasso, Italy.