Footnotes

• Twitter @Mark_MatthewsNZ, @Bill_Vicenzino

• Contributors MM contributed to the study conception and design, recruitment of participants, management of study proceedings, data collection and drafting and revision of the manuscript. APC, TM, RN and KMC contributed to the study conception and design, and drafting and revision of the manuscript. MSR contributed to the study design, recruitment of participants, management of study proceedings, data collection and reviewed the manuscript. JK contributed to the statistical analysis and reviewed the manuscript. BTV contributed to the study conception and design, recruitment of participants, data management and the drafting and revision of the manuscript. BTV and MM act as guarantors to affirm that this manuscript is an honest, accurate and transparent account of the study being reported; that no important aspects of the study have been omitted and that any discrepancies from the study as planned (and, if relevant, registered) have been explained. The corresponding author attests that all listed authors meet authorship criteria and that no others meeting the criteria have been omitted.

• Funding National Health and Medical Research Council (Ref: 631717).

• Competing interests BTV reports grants from Commonwealth of Australia National Health and Medical Research Council (Ref: 631717) and from Vionics International for this research. MM is supported by an Australian Postgraduate Award. BTV and TM are voluntary (non-compensated) members by invitation on the Vasyli Think Tank.

• Patient consent for publication Not required.

• Provenance and peer review Not commissioned; externally peer reviewed.