Article History
Received: 17 November 2017
Accepted: 23 May 2018
First Online: 29 May 2018
Ethics and consent to participate
: Ethical approval for the study was granted by the College Ethics Review Board at the University of Aberdeen (ethical approval number: CERB/2015/11/1235). Consent to participate was obtained at the beginning of the online survey, participants read a description of the study before clicking a button to indicate their consent to participate.
: The authors declare that they have no competing interests.
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