Zahl, Sverre Morten http://orcid.org/0000-0003-3303-6977
Egge, Arild
Helseth, Eirik
Skarbø, Anne-Britt
Wester, Knut
Funding for this research was provided by:
Helse Vest Regionalt Helseføretak (911439)
Article History
Received: 28 September 2018
Accepted: 28 November 2018
First Online: 6 December 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.