Gjermundsen, Endre F.
Briner, Jason P.
Akçar, Naki
Foros, Jørn
Kubik, Peter W.
Salvigsen, Otto
Hormes, Anne
Article History
Received: 24 November 2014
Accepted: 3 August 2015
First Online: 16 September 2015
Competing interests
: The authors declare no competing financial interests.