Beattie, Marguerite http://orcid.org/0000-0002-9224-9684
Hankonen, Nelli http://orcid.org/0000-0002-8464-2478
Salo, Gloria http://orcid.org/0000-0001-8271-758X
Knittle, Keegan http://orcid.org/0000-0002-2108-7112
Volanen, Salla-Maarit http://orcid.org/0000-0002-4436-9518
Funding for this research was provided by:
Signe ja Ane Gyllenbergin Säätiö
Yrjö Jahnssonin Säätiö
Juho Vainion Säätiö
Mats Brommels Foundation
Academy of Finland (285283)
Article History
First Online: 9 July 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were approved by the humanities and social and behavioral sciences ethical review board of the University of Helsinki (Statement 1/2014) as well as the department of education in the each school district. They were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants and their parents/ guardians. Participants were informed that participation was voluntary.