Text and Data Mining valid from 2019-12-01
Received: 23 January 2019
Accepted: 22 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants/parents included in the study.
: All authors declare that they have no conflict of interest.