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Submitted on: 15 August 2000.
Revised on: 08 November 2000.
Accepted on: 18 December 2000.
___________________Ibnosina Journal of Medicine and Biomedical Sciences
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Submitted on: 15 October 2003.
Revised on: 29 January 2004.
Accepted on: 09 February 2004.
___________________Ibnosina Journal of Medicine and Biomedical Sciences