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  • ‘Inverse Double Bubble’ sign for an effective adductor canal block: a novel approach for the ultrasound confirmation of being on the right site

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Letter to the editor
‘Inverse Double Bubble’ sign for an effective adductor canal block: a novel approach for the ultrasound confirmation of being on the right site

https://doi.org/10.1136/rapm-2018-100022

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    Footnotes

    • Contributors All authors contributed equally to the work.

    • 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 Not required.

    • Provenance and peer review Commissioned; internally peer reviewed.