Thijs, Jochem
Hornstra, Lisette
Charki, Fatima Zohra
Article History
Received: 1 June 2018
Accepted: 19 July 2018
First Online: 10 August 2018
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.
: Active consent was obtained from the teachers, and passive parental consent for the students. All participants included in the study participated voluntarily.