Submitted on: 13 April 2004.
Revised on: 13 May 2004.
Accepted on: 01 June 2004.
___________________Clinical and Translational Imaging
Submitted on: 10 February 2006.
Revised on: 10 March 2006.
Accepted on: 28 April 2006.
___________________Clinical and Translational Imaging
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Submitted on: 01 October 2006.
Revised on: 16 January 2007.
Accepted on: 15 March 2007.
___________________Clinical and Translational Imaging
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