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Submitted on: 17 January 1999.
Revised on: 27 April 1999.
Accepted on: 05 June 1999.
___________________Experimental and Therapeutic Medicine
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Submitted on: 18 February 1998.
Revised on: 28 May 1998.
Accepted on: 21 July 1998.
___________________Experimental and Therapeutic Medicine
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