Støen, Ragnhild
,
Songstad, Nils Thomas
Silberg, Inger Elisabeth
Fjørtoft, Toril
Jensenius, Alexander Refsum
Adde, Lars
Article History
Received: 11 December 2016
Accepted: 7 May 2017
First Online: 26 July 2017
Competing interests
: The authors declare no conflict of interest.