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Submitted on: 15 May 1999.
Revised on: 21 August 1999.
Accepted on: 23 September 1999.
___________________Japanese Journal of Radiology---SPRINGER
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Submitted on: 17 December 2013.
Revised on: 10 February 2014.
Accepted on: 30 March 2014.
___________________Japanese Journal of Radiology---SPRINGER
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Submitted on: 27 December 1998.
Revised on: 10 February 1999.
Accepted on: 20 March 1999.
___________________Japanese Journal of Radiology---SPRINGER
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