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Contributors SP helped design the study, analyze data, and write the manuscript; PEA helped design the study and write the manuscript; PP helped collect data and write the manuscript; DAE helped collect data and write the manuscript; MPP helped collect data and write the manuscript; FJ-R helped collect data and write the manuscript. YR helped collect data and write the manuscript; ESS helped design the study, collect data, analyze data, and write the manuscript.
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 Eric Schwenk is on the editorial board of Regional Anesthesia and Pain Medicine.
Provenance and peer review Not commissioned; externally peer reviewed.
Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.