2 Accademia Peloritana dei Pericolanti at the University of Messina, Messina, Italy.
3 Division for Endocrine and Minimally Invasive Surgery, Department of Human Pathology in Adulthood and Childhood "G. Barresi", University Hospital G. Martino, University of Messina, Via C. Valeria 1, 98125, Messina, Italy. gdionigi@unime.it.