Funding for this research was provided by:
Norges Forskningsråd (221065)
Helse Vest Regionalt Helseføretak (911716, 911605)
Received: 4 May 2020
Accepted: 13 October 2020
First Online: 21 October 2020
Ethics approval and consent to participate
: The study was approved by the Western Norway Regional Committee for Medical and Health Research Ethics (2011/1609). All participants gave written consent.
: Not applicable.
: The authors declare that they have no competing interests.