Text and Data Mining valid from 2019-04-04
Received: 9 January 2019
Accepted: 27 March 2019
First Online: 4 April 2019
Compliance with ethical standards
: The authors declare that there is no conflict of interest from any of the co-authors.
: 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.