Skrede, Turid
Aadland, Eivind
Andersen, Lars Bo
Stavnsbo, Mette
Anderssen, Sigmund Alfred
Resaland, Geir Kåre
Ekelund, Ulf http://orcid.org/0000-0003-2115-9267
Article History
Received: 4 January 2018
Revised: 13 March 2018
Accepted: 10 April 2018
First Online: 17 May 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.