Received: 2 June 2017
Accepted: 9 February 2018
First Online: 13 February 2018
Ethics approval and consent to participate
: All participants were informed of the survey’s aims and content. Ethical approval and written consent was not required for this type of study. According to the Danish Act on Research Ethics Review of Health Research Projects (S. 14(2) of Act No. 593 of 14 June 2011), no ethical approval was needed for the present study.
: Not applicable.
: The authors declare that they have no competing interests.
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