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Authors
Kaldenbach, Siri
Leonhardt, Marja
Lien, Lars
Bjærtnes, Asborg A.
Strand, Tor A.
Holten-Andersen, Mads N.
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Article History
Received: 6 December 2021
Accepted: 9 March 2022
First Online: 18 March 2022
Declarations
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: Written informed consent was obtained by parents for students who were younger than 16 years and by the students themselves if they were 16 years old. The Regional Committee for Medical Research Ethics; Region South East, (University of Oslo), approved the study in 2017 (project number: 2016/1755). All methods were performed in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests. The funding source did not play any role in the design and implantation of the study.
