Text and Data Mining valid from 2019-02-15
Received: 6 December 2018
Accepted: 12 February 2019
First Online: 15 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in this study were in accordance with the ethical standards of the institutional committee of the School of Medicine—ASP 3 Catania (ID: 083/17) and with the 1964 Helsinki declaration.
: Informed consent was obtained from all parents of children included in the study.