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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.