Submitted on: 09 December 2003.
Revised on: 09 February 2004.
Accepted on: 01 March 2004.
___________________Computer Assisted Surgery---TAYLOR & FRANCIS LTD
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Submitted on: 07 October 1998.
Revised on: 10 December 1998.
Accepted on: 21 December 1998.
___________________Computer Assisted Surgery---TAYLOR & FRANCIS LTD
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