Funding for this research was provided by:
Norges Forskningsråd (NFRgBPub)
Received: 6 December 2019
Accepted: 20 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: This study did not require official or institutional ethical approval.
: Not applicable.
: The authors declare that they have no competing interests.
: Data have not been published previously.