Text and Data Mining valid from 2020-04-13
Received: 26 August 2019
Accepted: 31 March 2020
First Online: 13 April 2020
Ethics approval and consent to participate
: The Ethical Committee of the Fondazione IRCCS Ca′ Granda Ospedale Maggiore Policlinico approved protocol. All patients or parents of children signed an informed consent to the study.
: The authors declare that they have no competing interests.