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Contributors KB: study design and planning, manuscript preparation and editing, analysis of results. CS: manuscript preparation and editing, analysis of results, data collection.
Funding This study was funded by Waikato Anaesthetic Department research fund.
Competing interests None declared.
Patient consent for publication Patients were not involved in this study
Ethics approval This study was approved by the Northern B Ethics Committee, and institutional approval was granted by the Waikato Hospital Research Committee.
Provenance and peer review Not commissioned; externally peer reviewed.