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Contributors PB made the original observation that no published guideline addresses this issue. He contributed to the review of the literature and the writing of the letter. The other three authors contributed to the research of the literature and the writing of the letter.
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 PB is the unpaid Chair, Canterbury Charity Hospital Trust.
Patient and public involvement Patients and/or the public were not involved in the design, conduct, reporting or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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