Received: 18 November 2018
Accepted: 30 January 2019
First Online: 13 February 2019
Ethics approval and consent to participate
: Ethical approval for this study was obtained from the Regional Ethical Review Board in Gothenburg, Sweden (399–8) and Human Research Ethics Committee, University of New South Wales, Australia (HC180497). A waiver of consent was granted by the ethics committees.
: Not applicable.
: The authors declare that they have no competing interests.
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