1 Department of Pediatrics, Vittore Buzzi Children's Hospital, University of Milan, Milan, Italy.
2 Department of Health Science, University of Milan, Milan, Italy.
3 Department of Biomedical and Clinical Sciences, University of Milan, Milan, Italy.
4 Department of Woman, Child and General and Specialized Surgery, University of Campania "Luigi Vanvitelli", Naples, Italy. caterina.strisciuglio@unicampania.it.