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Article History

Received: 5 March 2018

Accepted: 31 March 2019

First Online: 15 April 2019

Ethics approval and consent to participate

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the IRCCS San Raffaele Pisana Ethics Committee, Roma (Italy) (Protocol identification number: SPOL – 17/17 – 6/2017). All participants were volunteers and gave written informed consent which was confirmed by parents if necessary.

: Not applicable.

: The authors declare that they have no competing interests. All authors declare no conflicts of interest and any financial interest. All authors attest and affirm that the material within has not been and will not be submitted for publication elsewhere.

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