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Contributors SP contributed to study conception, data acquisition, analysis and interpretation and manuscript preparation. CKL contributed to data acquisition, data analysis and manuscript preparation. TJC contributed to data analysis and manuscript preparation. JSV contributed to data analysis and manuscript review. BCHT contributed to study conception, data acquisition, analysis and interpretation and manuscript preparation.
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 BCHT contributed in part to the design of the catheter-over-needle used in the study.
Provenance and peer review Not commissioned; externally peer reviewed.
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