Submitted on: 30 January 2009.
Revised on: 17 March 2009.
Accepted on: 11 April 2009.
___________________EJSO---ELSEVIER SCI LTD
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Submitted on: 18 January 2000.
Revised on: 11 March 2000.
Accepted on: 25 April 2000.
___________________EJSO---ELSEVIER SCI LTD
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