1 "G. D'Alessandro" Department of Health Promotion, Mother and Child Health and Internal Medicine, University of Palermo, Palermo, Italy.
2 "G. D'Alessandro" Department of Health Promotion, Mother and Child Health and Internal Medicine, University of Palermo, Palermo, Italy - omarenzosantangelo@hotmail.it.
3 Postgraduate School of Hygiene and Preventive Medicine, Department of Experimental Medicine, University of Perugia, Perugia, Italy.