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Submitted on: 27 August 2006.
Revised on: 07 November 2006.
Accepted on: 24 December 2006.
___________________Australian Critical Care---ELSEVIER SCIENCE INC
Submitted on: 22 October 2002.
Revised on: 10 February 2003.
Accepted on: 09 April 2003.
___________________Australian Critical Care---ELSEVIER SCIENCE INC
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Submitted on: 05 December 2004.
Revised on: 18 March 2005.
Accepted on: 17 April 2005.
___________________Australian Critical Care---ELSEVIER SCIENCE INC
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