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Submitted on: 30 November 2003.
Revised on: 28 February 2004.
Accepted on: 21 March 2004.
___________________Biomedical Research and Therapy
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Submitted on: 11 May 1998.
Revised on: 17 July 1998.
Accepted on: 24 August 1998.
___________________Biomedical Research and Therapy