Knudsen, Markus Dines
Berstad, Paula
HjartÄker, Anette
Gulichsen, Elisabeth Haagensen
Hoff, Geir
de Lange, Thomas
Bernklev, Tomm
Botteri, Edoardo
Article History
Received: 18 April 2017
Revised: 30 May 2017
Accepted: 31 May 2017
First Online: 13 July 2017
Competing interests
: The authors declare no conflict of interest.