Ekelund, U https://orcid.org/0000-0003-2115-9267
Kolle, E
Steene-Johannessen, J
Dalene, K E
Nilsen, A K O
Anderssen, S A
Hansen, B H
Article History
Received: 15 May 2017
Revised: 6 July 2017
Accepted: 23 July 2017
First Online: 4 August 2017
Competing interests
: The authors declare no conflict of interest.