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Letter to the editor
PENG block: points to ponder

https://doi.org/10.1136/rapm-2018-100327

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    Footnotes

    • 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.

    • Disclaimer We are not including any figures or tables from another publication.

    • Competing interests None declared.

    • Patient consent Taken

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