Funding for this research was provided by:
Queensland University of Technology (HDR Student Supplementary funding, QUTPRA)
Received: 5 January 2019
Accepted: 23 May 2019
First Online: 8 June 2019
Ethics approval and consent to participate
: Ethics approval was obtained from the Queensland University of Technology Human Research Ethics Committee (Approval No 1700000703) and Hanoi University of Public health (Decision Number 345/2017/YTCC-HD3 dated 31/8/2017).
: Not applicable.
: The authors declare that they have no competing interests.