Received: 6 July 2017
Accepted: 20 February 2018
First Online: 2 March 2018
Ethics approval and consent to participate
: The Regional ethics committee concluded that this study did not need an approval from the REK. The Ombudsman, Norwegian Social Science Data Services (NSD), approved and registered the survey. NSD was responsible for the questionnaire distribution and the data collection.All participants received an email explaining the purpose of the study and informing them that all participation in this study was voluntary. The email included a link to the electronic questionnaire, which contained an informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.
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