1 Birmingham Acute Care Research Group, University of Birmingham, Birmingham, United Kingdom.
2 Department of Anaesthetics and Critical Care, Queen Elizabeth Hospital Birmingham, Birmingham, United Kingdom.
Drs. Parekh, Bangash, and Patel are joint senior authors.
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Drs. Chotalia and Ali collected the data and performed the analysis. Drs. Chotalia, Parekh, Bangash, and Patel conceived and designed the analysis and wrote the article. Drs. Hebballi and Singh revised the article for important intellectual content. All authors have read and approved the final article.
Dr. Parekh received support for article research from the National Institute for Health Research. Dr. Bangash received funding from the Intensive Care Society and a regional research scholarship fund. The remaining authors have disclosed that they do not have any potential conflicts of interest.
This work was performed at Birmingham Acute Care Research Group, University of Birmingham, Mindelsohn Way, Birmingham, United Kingdom.
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