Nordgård, Anna Synnøve Røstad http://orcid.org/0000-0002-6214-4662
Bergland, Wenche Hennie
Vadstein, Olav
Mironov, Vladimir
Bakke, Rune
Østgaard, Kjetill
Bakke, Ingrid
Article History
Received: 3 July 2017
Accepted: 6 October 2017
First Online: 8 November 2017
Competing Interests
: The authors declare that they have no competing interests.