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Submitted on: 30 June 2001.
Revised on: 21 August 2001.
Accepted on: 17 September 2001.
___________________IEEE Reviews in Biomedical Engineering
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Submitted on: 01 May 2008.
Revised on: 29 June 2008.
Accepted on: 08 August 2008.
___________________IEEE Reviews in Biomedical Engineering
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