Johnsen, Jahn Petter
Søreng, Siri Ulfsdatter
Article History
Received: 12 March 2018
Accepted: 8 October 2018
First Online: 6 November 2018
Compliance with ethical standards
: The authors comply with the guidelines for research ethics from the Norwegian National Committee for Research Ethics in the Social Sciences and Humanities.
: The authors declare that they have no competing interests.