Øynebråten, Inger
Barois, Nicolas
Bergeland, Trygve
Küchler, Axel M.
Bakke, Oddmund
Haraldsen, Guttorm
Article History
Received: 28 October 2014
Accepted: 2 February 2015
First Online: 20 March 2015
Competing interests
: The authors declare no competing financial interests.