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Submitted on: 25 October 2000.
Revised on: 26 January 2001.
Accepted on: 09 March 2001.
___________________Caspian Journal of Internal Medicine
Submitted on: 12 October 2004.
Revised on: 03 January 2005.
Accepted on: 03 March 2005.
___________________Caspian Journal of Internal Medicine