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Letter
Keep it simple and cheap, enhancing the quality of regional analgesia
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Twitter @AndresR00916584
Contributors Author’s individual contribution to the manuscript. ARR helped in conception, design, analysis and interpretation of data and manuscript writing. RAU helped in analysis and interpretation of data and manuscript writing. MFP helped in design, analysis and interpretation of data and manuscript writing.
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 peer reviewed.