Hodnebrog, Øivind
Myhre, Gunnar http://orcid.org/0000-0002-4309-476X
Forster, Piers M.
Sillmann, Jana
Samset, Bjørn H.
Article History
Received: 10 August 2015
Accepted: 4 March 2016
First Online: 12 April 2016
Competing interests
: The authors declare no competing financial interests.