Submitted on: 16 October 2007.
Revised on: 28 December 2007.
Accepted on: 22 February 2008.
___________________Biomedical and Biotechnology Research Journal
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Submitted on: 20 February 1998.
Revised on: 13 April 1998.
Accepted on: 13 May 1998.
___________________Biomedical and Biotechnology Research Journal