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Submitted on: 13 September 2008.
Revised on: 24 November 2008.
Accepted on: 25 December 2008.
___________________ACS Biomaterials Science & Engineering
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Submitted on: 14 October 2003.
Revised on: 13 December 2003.
Accepted on: 23 January 2004.
___________________ACS Biomaterials Science & Engineering
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