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Article History

Received: 24 April 2018

Accepted: 17 January 2019

First Online: 8 February 2019

Ethics approval and consent to participate

: All research in HUNT is in accordance with the guidelines of the Regional Committee for Medical Research Ethics (REK), Data Inspectorate and applicable law. We do not possess any person identifiable data. All participants in the HUNT study signed an informed consent form allowing the use of their data for research. Participants can demand to have their data deleted from the HUNT database at any given moment.

: Not applicable.

: The authors declare that they have no competing interests.

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