Received: 18 October 2018
Accepted: 12 April 2019
First Online: 20 May 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Bambino Gesù Children’s Hospital (N: 1237/2016).
: Considering the retrospective study design, written informed consent was not deemed necessary.
: The authors declare that they have no competing interests.
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