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November 2023: This guidance is currently under review as it has gone beyond the standard review date. It reflects best practice at the time of authorship / last review and remains safe for use. If there are any concerns regarding the content then please consult with senior clinical staff to confirm.
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Last reviewed: 01 October 2014
Next review: 30 April 2024
Author(s): Dr R Kole & Dr S Sweeney
Approved By: Clinical Effectiveness
Reviewer Name(s): ED Guidelines Group