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Submitted on: 30 May 2006.
Revised on: 20 June 2006.
Accepted on: 16 July 2006.
___________________Australian Critical Care---ELSEVIER SCIENCE INC
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Submitted on: 03 December 2005.
Revised on: 09 January 2006.
Accepted on: 26 January 2006.
___________________Australian Critical Care---ELSEVIER SCIENCE INC
Submitted on: 22 September 2006.
Revised on: 21 December 2006.
Accepted on: 22 January 2007.
___________________Australian Critical Care---ELSEVIER SCIENCE INC