Kirkhus, Lene
Šaltytė Benth, Jūratė
Rostoft, Siri
Grønberg, Bjørn Henning
Hjermstad, Marianne J
Selbæk, Geir
Wyller, Torgeir B
Harneshaug, Magnus
Jordhøy, Marit S
Article History
Received: 16 December 2016
Revised: 21 May 2017
Accepted: 7 June 2017
First Online: 29 June 2017
Competing interests
: The authors declare no conflict of interest.