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Contributors Y-BK had full access to all of the data in the study and takes responsibility for the integrity of the data and accuracy of the analysis. All authors contributed to study concept and design and statistical analysis. Y-BK and MAD drafted the manuscript. All authors critically revised the manuscript for important intellectual content. MAD contributed to administrative, technical, or material support. MAD and TB supervised the study.
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 BDS is Editor-in-Chief for Regional Anesthesia & Pain Medicine Journal. MAD is Associate Editor-in-Chief for Statistics for Regional Anesthesia & Pain Medicine. All authors agree to complete and submit the ICMJE Form for Disclosure of Potential Conflicts of Interest upon request.
Provenance and peer review Not commissioned; externally peer reviewed.