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Authors
Mikkelsen, Hilde Timenes
Haraldstad, Kristin
Helseth, Sølvi
Skarstein, Siv
Småstuen, Milada Cvancarova
Rohde, Gudrun
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Article History
Received: 26 November 2020
Accepted: 16 August 2021
First Online: 30 August 2021
Declarations
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: The adolescents received oral and written information. The written information was distributed to the parents. Active informed consent was obtained from both the adolescents and their parents. Data in the study were anonymized. All procedures performed in the study were in accordance with the ethical standards of the institutional and/or national research committee, as well as with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Approval was obtained from the ethics committee of the Faculty of Health and Sport Sciences at the University of Agder and from the Norwegian Centre for Research Data (NSD Reference: 60981).
: Not applicable.
: The authors declare that they have no competing interests.
