Footnotes

• Twitter @jonhaydensmith

• Contributors JS initiated the response. JB and MD performed the bench testing and subsequent data modelling. All authors reviewed the proposal in the context of the literature and contributed to this communication in response.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests None declared.

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