Backe, Paul Hoff
Laerdahl, Jon K.
Kittelsen, Lene Svendsen
Dalhus, Bjørn
Mørkrid, Lars
Bjørås, Magnar
Article History
Received: 29 November 2019
Accepted: 13 March 2020
First Online: 27 March 2020
Competing interests
: The authors declare no competing interests.