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Submitted on: 21 November 2005.
Revised on: 04 February 2006.
Accepted on: 27 March 2006.
___________________Advanced Biomedical Engineering
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Submitted on: 15 February 2009.
Revised on: 02 April 2009.
Accepted on: 30 April 2009.
___________________Advanced Biomedical Engineering
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