Iversen, Elisabeth
Packer, Erik J. S.
Sandberg, Synne M.
Bleie, Øyvind
Hoff, Per Ivar
Schuster, Peter
Article History
Received: 19 February 2018
Accepted: 6 April 2018
First Online: 18 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and the national research committee.
: Informed consent was obtained from all individual participants included in the study.