Funding for this research was provided by:
Universitetet i Tromsø (IN-1096130 (Funding of publication charges))
Received: 23 December 2019
Accepted: 21 May 2020
First Online: 8 June 2020
Ethics approval and consent to participate
: Ethics approval for this study was obtained from the Regional Committee for Medical and Health Ethics in Northern Norway (2015/614). All participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.