TranvÄg, Eirik Joakim
Norheim, Ole Frithjof
Ottersen, Trygve
Funding for this research was provided by:
Universitetet i Bergen
Universitetet i Oslo
Article History
Received: 5 October 2017
Accepted: 30 April 2018
First Online: 9 May 2018
Ethics approval
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.