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Authors
Grøtvedt, Liv https://orcid.org/0000-0001-8745-2648
Forsén, Lisa
Ariansen, Inger
Graff-Iversen, Sidsel
Lingaas Holmen, Turid
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Article History
Received: 19 December 2018
Accepted: 2 September 2019
First Online: 13 September 2019
Ethics approval and consent to participate
: All HUNT surveys are licenced by the Norwegian Data Inspectorate. Our study is approved by the Regional Committee for Medical and Health Research Ethics. All participants gave written consent, in addition to consent from the parents/ guardians for those under the age of 16 years.
: Not applicable.
: The authors declare that they have no competing interests.
