Funding for this research was provided by:
Norwegian Health Ministry
NORCE Norwegian research centre
The research council of Norway
Received: 20 March 2020
Accepted: 17 June 2020
First Online: 26 June 2020
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical and Health Research Ethics in Western Norway with approval number 2011/811/REK Vest. All subjects provided electronic consent to participate prior to inclusion in the study.
: Not required.
: None declared.