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Submitted on: 03 September 2014.
Revised on: 05 December 2014.
Accepted on: 13 January 2015.
___________________Biointerphases---AIP PUBLISHING
Submitted on: 23 October 2003.
Revised on: 17 December 2003.
Accepted on: 04 February 2004.
___________________Biointerphases---AIP PUBLISHING