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Submitted on: 03 June 2006.
Revised on: 15 August 2006.
Accepted on: 19 September 2006.
___________________International Journal of Polymeric Materials and Polymeric Biomaterials
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Submitted on: 13 June 2011.
Revised on: 10 August 2011.
Accepted on: 01 September 2011.
___________________International Journal of Polymeric Materials and Polymeric Biomaterials