Footnotes

• Contributors RLM and JFT conceived the letter in response to Badgery-Parker et al (2018). RLM wrote the first draft and this was reviewed and refined by JFT. Both authors approved the final submitted version.

• 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.

• Patient consent for publication Not required.

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