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Article History

Received: 15 November 2018

Accepted: 10 July 2019

First Online: 25 July 2019

Ethics approval and consent to participate

: Ethical approval was granted from the University of Sydney Human Research Ethics Committee for each of the original studies and separately for the current secondary analysis study (Approval # 2016/760). Participants provided informed consent to participate in the original projects. Separate consent for the secondary analysis was not required by HREC because: a) The use of the data in this project was not significantly different from the purpose for which they were initially collected (with consent) - the major difference was the combining of 2 data-sets; b) The risk to participants was negligible, while the potential benefits of this project are considerable; c) Difficulty contacting participants made separate consent unfeasible; d) Participants’ privacy is protected and their data remains confidential; and e) There was no reason to think that participants would not have consented to this use of their data had they been asked. This is in accordance with the Australian “National Statement on Ethical Conduct in Human Research” ().

: Not applicable.

: The authors declare that they have no competing interests.