1 Department of Woman, Child and of General and Specialized Surgery, University of Campania "Luigi Vanvitelli", Naples, Italy; European Pediatric Association, Union of National European Pediatric Societies and Associations, Berlin, Germany.
2 European Pediatric Association, Union of National European Pediatric Societies and Associations, Berlin, Germany; Department of Medical and Surgical Sciences, Pediatric Unit, University of Foggia, Foggia, Italy. Electronic address: mpm@unifg.it.