Haaga, Kristian Agasøster http://orcid.org/0000-0001-6880-8725
Brendryen, Jo
Diego, David
Hannisdal, Bjarte http://orcid.org/0000-0002-7637-758X
Article History
Received: 14 May 2018
Accepted: 20 July 2018
First Online: 1 August 2018
Competing Interests
: The authors declare no competing interests.