Received: 14 January 2021
Accepted: 13 April 2021
First Online: 24 April 2021
: The study was conducted according to the guidelines set out in the Declaration of Helsinki and all procedures involving research study participants were approved by the Ethics Committee of ASST-FBF-Sacco. Verbal informed consent was obtained from all parents/legal representatives of the included subjects and was witnessed and formally recorded.
: Not applicable.
: The authors have no conflict of interest to declare.