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Submitted on: 10 March 2000.
Revised on: 18 May 2000.
Accepted on: 21 June 2000.
___________________EJSO---ELSEVIER SCI LTD
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Submitted on: 02 November 2000.
Revised on: 09 February 2001.
Accepted on: 21 March 2001.
___________________EJSO---ELSEVIER SCI LTD
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Submitted on: 25 January 2006.
Revised on: 02 March 2006.
Accepted on: 15 March 2006.
___________________EJSO---ELSEVIER SCI LTD
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