Vullum, Per Erik
Nord, Magnus
Vatanparast, Maryam
Thomassen, Sedsel Fretheim
Boothroyd, Chris
Holmestad, Randi
Fimland, Bjørn-Ove
Reenaas, Turid Worren
Article History
Received: 29 November 2016
Accepted: 22 February 2017
First Online: 28 March 2017
Competing interests
: The authors declare no competing financial interests.