Text and Data Mining valid from 2020-03-18
Received: 12 December 2019
Accepted: 11 March 2020
First Online: 18 March 2020
Ethics approval and consent to participate
: The study was approved by the Rome Ethics Committee of Sapienza University (n. 5377).Written informed consent for participation in the study was obtained for subjects under 16 years old from their parent or guardian.
: Not applicable.
: The authors declare that they have no competing interests.