Funding for this research was provided by:
Universitetet i Bergen
Received: 10 July 2020
Accepted: 26 November 2020
First Online: 4 December 2020
Ethics approval and consent to participate
: All participants signed a written informed consent form, and the study protocol was approved by the Regional Committee for Medical and Health Research Ethics (REC West).
: Not applicable.
: The authors declare that they have no competing interests.