Funding for this research was provided by:
Leiden University
Article History
First Online: 6 March 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All research procedures involving human participants were approved by the Institutional Review Board of the Institute of Education and Child Studies at Leiden University, in accordance with the standards laid down in the 1964 Helsinki declaration and its later amendments.
: Informed consent was obtained from all participating students.