Submitted on: 02 September 1998.
Revised on: 01 December 1998.
Accepted on: 25 December 1998.
___________________Egyptian Journal of Critical Care Medicine
Submitted on: 31 August 2010.
Revised on: 08 October 2010.
Accepted on: 31 October 2010.
___________________Egyptian Journal of Critical Care Medicine
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Submitted on: 16 September 2006.
Revised on: 04 December 2006.
Accepted on: 16 January 2007.
___________________Egyptian Journal of Critical Care Medicine