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Submitted on: 20 August 2010.
Revised on: 15 October 2010.
Accepted on: 15 November 2010.
___________________Biointerphases---AIP PUBLISHING
Submitted on: 30 July 2010.
Revised on: 07 September 2010.
Accepted on: 05 October 2010.
___________________Biointerphases---AIP PUBLISHING
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