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Weak at the knees

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Footnotes

  • Contributors CK wrote the manuscript. TH and BG provided oversight and approved the final version of the manuscript.

  • 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.

  • Provenance and peer review Not commissioned. Externally reviewed by Jon Walters, Swansea, UK.

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