van Beek, Yolanda http://orcid.org/0000-0001-9986-9467
Berg, Anne
Funding for this research was provided by:
Utrecht University
Article History
First Online: 9 February 2019
Compliance with Ethical Standards
:
: The authors declare that they have 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. The study was approved by the medical ethical committee of the Utrecht University and confidentiality of collected data was ensured. Prior to the study, participants, their parents and the schools were informed about the global goals of the study and, after approval, could stop participating at any time. They were informed in more detail after the study.