1 Department of Pediatrics, Santa Maria Delle Croci Hospital, Ravenna, Italy. Electronic address: alessandraiacono@alice.it.
2 Department of Pediatrics, Santa Maria Delle Croci Hospital, Ravenna, Italy; Department of Medical Sciences, Pediatrics, University of Ferrara, Ferrara, Italy.
3 Department of Pediatrics, Santa Maria Delle Croci Hospital, Ravenna, Italy.