Mamen, Asgeir
Fredriksen, Per Morten http://orcid.org/0000-0001-7450-2925
Article History
Received: 17 November 2017
Accepted: 7 June 2018
First Online: 18 June 2018
Compliance with ethical standards
:
: The authors declare no competing financial interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Participants gave written informed consent before starting the study.