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Article History

Received: 22 March 2018

Accepted: 21 May 2018

First Online: 29 May 2018

Ethics approval and consent to participate

: The study was approved by the Ethics Committee of the Bambino Gesù Children’s Hospital according to the Declaration of Helsinki (as revised in Seoul, Korea, October 2008).

: The authors declare that they have no competing interests. No financial or non-financial benefits have been received or will be received from any party related directly or indirectly to the subject of this article. No honorarium, grant, or other form of payment was given to anyone to produce the manuscript.

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