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Contributors BDS had full access to all of the data in the study and took responsibility for the integrity of the data and accuracy of the analysis. Study concept and design: BDS, GJK and ABP. Acquisition of data: BDS, GJK and ABP. Drafting of manuscript: BDS, GJK, ABP and MD. Critical revision of the manuscript for important intellectual content: all authors. Statistical analysis: MD and BDS. Administrative, technical, or material support: BDS. Study supervision: BDS.
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 and Pain Medicine Journal. MD is executive editor for Statistics for Regional Anesthesia and Pain Medicine. All authors agreed to complete and submit the ICMJE Form for disclosure of potential conflicts of interest on request.
Provenance and peer review Commissioned; externally peer reviewed.