Submitted on: 23 February 2004.
Revised on: 20 March 2004.
Accepted on: 08 April 2004.
___________________Bioactive Materials---KEAI PUBLISHING LTD
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Submitted on: 10 April 2009.
Revised on: 24 May 2009.
Accepted on: 16 June 2009.
___________________Bioactive Materials---KEAI PUBLISHING LTD
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Submitted on: 23 April 2015.
Revised on: 20 August 2015.
Accepted on: 04 September 2015.
___________________Bioactive Materials---KEAI PUBLISHING LTD
Submitted on: 29 January 2003.
Revised on: 15 May 2003.
Accepted on: 26 May 2003.
___________________Bioactive Materials---KEAI PUBLISHING LTD