Submitted on: 11 November 2005.
Revised on: 18 February 2006.
Accepted on: 04 March 2006.
___________________Journal of the Intensive Care Society
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Submitted on: 23 November 2020.
Revised on: 26 December 2020.
Accepted on: 12 January 2021.
___________________Journal of the Intensive Care Society
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