Received: 8 February 2018
Accepted: 3 July 2018
First Online: 16 July 2018
Ethics approval and consent to participate
: Not applicable.
: The publication of this review was approved by the Ethics Committee of Ospedale Santa Maria della Misericordia, Perugia, Italy. Written informed consent was obtained from either the parent(s) or legal guardian(s) of each patient mentioned in the review, and the children who were aged > 8 years signed to confirm their consent.
: The authors declare that they have no competing interests.
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