3 Department of Human Pathology, University of Messina, Messina, Italy.
4 Department of Health Promotion Sciences and Mother and Child Care "G. D'Alessandro", University of Palermo, Palermo, Italy. [email protected].
5 UOC Malattie Infettive e Centro Regionale di Riferimento AIDS-AOU Policlinico "P. Giaccone", Università di Palermo, Via del Vespro 129, 90127, Palermo, Italy. [email protected].