Received: 19 May 2020
Accepted: 27 November 2020
First Online: 1 December 2020
Ethics approval and consent to participate
: The participants gave informed written consent for their participation in the study in accordance with the guidelines of the Declaration of Helsinki. Consent to participate was obtained from the parents/guardians of the minors included in this study. The ethics committee of Sapienza – University of Rome approved the study before its start.
: Not applicable.
: The authors declare that they have no competing interests.