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Contributors ZZ and KC: participated in the interpretation of data and drafting the manuscript. AB: participated in the conception of the manuscript, interpretation of data, and drafting the manuscript.
Funding This study was funded by Internal research funding from the Department of Anesthesia and Pain Management, University Health Network, Toronto, ON, Canada.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.