Funding for this research was provided by:
Jacobs Foundation (Young Scholars' Research Grant)
Article History
Received: 22 March 2018
Accepted: 31 May 2018
First Online: 19 June 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.
: Passive parental consent was obtained, and all students included in the study participated voluntarily.