Submitted on: 17 August 2010.
Revised on: 01 October 2010.
Accepted on: 13 November 2010.
___________________Bioactive Materials---KEAI PUBLISHING LTD
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Submitted on: 07 April 2012.
Revised on: 03 June 2012.
Accepted on: 11 July 2012.
___________________Bioactive Materials---KEAI PUBLISHING LTD
Submitted on: 17 June 2006.
Revised on: 07 July 2006.
Accepted on: 13 August 2006.
___________________Bioactive Materials---KEAI PUBLISHING LTD
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Submitted on: 18 October 1998.
Revised on: 13 February 1999.
Accepted on: 06 April 1999.
___________________Bioactive Materials---KEAI PUBLISHING LTD
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