Teigen, Karl Halvor http://orcid.org/0000-0001-6165-9034
Kanten, Alf Børre
Article History
Received: 21 May 2019
Accepted: 24 September 2019
First Online: 30 September 2019
Compliance with ethical standards
:
: There is no conflict of 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.