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Contributors The following authors contributed to the design, conduct, and reporting of the results: CG-V, IRJ, MG-R, AJG-B, JDA, AB, and MAR. In addition, IRJ was responsible for the statistical analyses. Data collection was performed by CC-V and MAR.
Funding Support was provided by the Fondo Investigación Sanitaria—Instituto Carlos III (project no. DTS17/00053) and by the European Society of Regional Anaesthesia (research grant no. 2018).
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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