Jonsson, Marte
Ragnum, Harald Bull
Julin, Cathinka Halle
Yeramian, Andree
Clancy, Trevor
Frikstad, Kari-Anne Myrum
Seierstad, Therese
Stokke, Trond
Matias-Guiu, Xavier
Ree, Anne Hansen
Flatmark, Kjersti
Lyng, Heidi
Article History
Revised: 22 July 2016
Accepted: 11 August 2016
First Online: 6 September 2016
Competing interests
: The authors declare no conflict of interest.