Stenehjem, Jo S
Smeland, Knut B
Murbraech, Klaus
Holte, Harald
Kvaløy, Stein
Thorsen, Lene
Arbo, Ingerid
Jones, Lee W
Aakhus, Svend
Lund, May Brit
Kiserud, Cecilie E
Article History
Received: 28 January 2016
Revised: 4 April 2016
Accepted: 16 May 2016
First Online: 28 June 2016
Competing interests
: The authors declare no conflict of interest.