The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Melissa J Bloomer is associate editor for Intensive & Critical Care Nursing and was not involved in the editorial review or the decision to publish this article. The other authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

The authors would like to thank and acknowledge the members of the wider research team: Jason Meyer, Elizabeth Manias, Gordon Laurie, Stewart Mealing, Kellie Sosnowski and Belinda Badman.

Not applicable.

Nil.

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