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Letter to the editor
PENG block: points to ponder

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  • 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.

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