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Submitted on: 19 July 2001.
Revised on: 12 November 2001.
Accepted on: 19 December 2001.
___________________Journal of Mechanics in Medicine and Biology
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Submitted on: 01 August 2001.
Revised on: 23 October 2001.
Accepted on: 28 November 2001.
___________________Journal of Mechanics in Medicine and Biology
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