Funding for this research was provided by:
Norges Forskningsråd (270038, 237841)
Received: 17 September 2019
Accepted: 13 December 2019
First Online: 27 December 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.
: The research did not involve human participants and/or animals.