Nygaard, Gyrid
Herfindal, Lars
Asrud, Kathrine S.
Bjørnstad, Ronja
Kopperud, Reidun K.
Oveland, Eystein http://orcid.org/0000-0003-2206-1480
Berven, Frode S.
Myhren, Lene
Hoivik, Erling A.
Lunde, Turid Helen Felli
Bakke, Marit
Døskeland, Stein O.
Selheim, Frode
Article History
Received: 1 February 2017
Accepted: 17 July 2017
First Online: 18 August 2017
Competing Interests
: The authors declare that they have no competing interests.