Submitted on: 11 April 2007.
Revised on: 15 May 2007.
Accepted on: 30 May 2007.
___________________Biomedical and Biotechnology Research Journal
Submitted on: 23 June 1999.
Revised on: 29 September 1999.
Accepted on: 15 October 1999.
___________________Biomedical and Biotechnology Research Journal
Submitted on: 17 June 2003.
Revised on: 17 July 2003.
Accepted on: 21 August 2003.
___________________Biomedical and Biotechnology Research Journal
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Submitted on: 12 August 2001.
Revised on: 21 October 2001.
Accepted on: 15 December 2001.
___________________Biomedical and Biotechnology Research Journal
Submitted on: 07 April 2013.
Revised on: 03 August 2013.
Accepted on: 19 August 2013.
___________________Biomedical and Biotechnology Research Journal
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Submitted on: 20 November 2012.
Revised on: 05 February 2013.
Accepted on: 30 March 2013.
___________________Biomedical and Biotechnology Research Journal