Submitted on: 27 August 2004.
Revised on: 19 November 2004.
Accepted on: 02 January 2005.
___________________Bioactive Materials---KEAI PUBLISHING LTD
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Submitted on: 11 October 1998.
Revised on: 13 January 1999.
Accepted on: 22 February 1999.
___________________Bioactive Materials---KEAI PUBLISHING LTD
Submitted on: 08 December 2004.
Revised on: 04 April 2005.
Accepted on: 01 June 2005.
___________________Bioactive Materials---KEAI PUBLISHING LTD
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