Funding for this research was provided by:
Liaison Committee for education, research and innovation in Central Norway (90061500)
Text and Data Mining valid from 2019-11-12
Received: 30 April 2019
Accepted: 31 October 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: This study was approved by the Regional Committee for Medical and Health Research Ethics of South-East Norway (reference number 2016/672) on date 04.27.2016. All participants in the HUNT study signed a written informed consent form allowing the use of their data and samples 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.