Text and Data Mining valid from 2018-08-17
First Online: 17 August 2018
Compliance with Ethical Standards
: Author 1 (blind for review) declares she has no conflict of interest. Author 2 (blind for review) declares that she has no conflict of interest. Author 3 (blind for review) has no conflict of interest.
: 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 parental consent and participant assent was obtained from all individual participants included in the study.