Myhre, Oddvar http://orcid.org/0000-0002-8635-4699
Eide, Dag Marcus http://orcid.org/0000-0001-5017-0145
Kleiven, Synne http://orcid.org/0000-0002-6761-2293
Utkilen, Hans Christian http://orcid.org/0000-0001-6120-7898
Hofer, Tim http://orcid.org/0000-0003-4757-2033
Article History
Received: 6 October 2017
Accepted: 17 January 2018
First Online: 2 February 2018
Competing Interests
: The authors declare that they have no competing interests.