Chortatos, Arthur https://orcid.org/0000-0002-1052-329X
Terragni, Laura
Henjum, Sigrun
Gjertsen, Marianne
Torheim, Liv Elin
Gebremariam, Mekdes K
Article History
Received: 25 January 2018
Accepted: 1 October 2018
First Online: 16 October 2018
Ethics approval and consent to participate
: Ethical clearance for the study was obtained from the responsible institutional body, the Norwegian Social Sciences Data Services, which is the data protection official for research. Written informed consent was obtained from all parents of participating adolescents; adolescents provided assent. School administrators also provided consent for the study.
: ‘Not applicable’.
: The authors declare that they have no competing interests.
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