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Authors
Larsen, T.
Urke, H. B.
Holsen, I.
Anvik, C. H.
Olsen, T.
Waldahl, R. H.
Antonsen, K. M.
Johnson, R.
Tobro, M.
Brastad, B.
Hansen, T. B.
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Funding
Funding for this research was provided by:
Ministry of Education of Norway (20161789)
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Article History
Received: 3 November 2017
Accepted: 28 February 2018
First Online: 9 March 2018
Ethics approval and consent to participate
: The study is approved by the Norwegian Centre for Research Data (NSD), with registration number 48551. Participants below 16 years at time of data collection need parental consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
