Funding for this research was provided by:
Norges Forskningsråd (230354)
Article History
Received: 8 April 2017
Accepted: 1 September 2017
First Online: 12 September 2017
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest.
: All procedures performed in the study 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.
Free to read: This content has been made available to all.