Funding for this research was provided by:
Norges Forskningsråd (196156)
Article History
First Online: 6 April 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in the study were in accordance with the ethical standards of the institutional and/or national research committee (approved by the Regional Committees for Medical and Health Research Ethics in Norway) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: All participants provided informed consent.