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Submitted on: 30 November 2002.
Revised on: 20 January 2003.
Accepted on: 24 February 2003.
___________________CANCER IMAGING---BMC
Submitted on: 19 October 2004.
Revised on: 14 January 2005.
Accepted on: 24 January 2005.
___________________CANCER IMAGING---BMC
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