Submitted on: 03 April 2003.
Revised on: 26 July 2003.
Accepted on: 19 September 2003.
___________________BMC MEDICAL IMAGING---BMC
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Submitted on: 26 February 2006.
Revised on: 17 April 2006.
Accepted on: 03 May 2006.
___________________BMC MEDICAL IMAGING---BMC
Submitted on: 25 October 2016.
Revised on: 14 December 2016.
Accepted on: 09 February 2017.
___________________BMC MEDICAL IMAGING---BMC
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