Received: 4 June 2018
Accepted: 22 November 2018
First Online: 28 January 2019
Ethics approval and consent to participate
: DINOS gained the approval of Padova Ethics Committee (n. 3960/U16/2016). The procedures were in accordance with the ethical standards of the Declaration of Helsinki; specific written informed consent from parents and from children over 12 years was obtained.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.