Text and Data Mining valid from 2018-11-19
Received: 19 July 2018
Accepted: 26 October 2018
First Online: 19 November 2018
Ethics approval and consent to participate
: The Regional Ethics Committee in Umeå approved the study: (dnr 2011–262-31 M.). The return of students’ completed questionnaires was considered as consent for participation.
: Not applicable.
: The authors declare that they have no competing interests.
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