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Alfentanil conversion ratios and successful analgesia

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  • Contributors AT is responsible for the literature review, planning, data collection, analysis and interpretation, and drafted the manuscript. CS conceived the study, contributed to planning and data interpretation, and edited 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 None declared.

  • Provenance and peer review Not commissioned; internally peer reviewed.