- Correspondence to Dr Seong Ho Park, Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Asanbyeongwon-gil 86, Songpa-gu, Seoul 138-736, Korea;
- Revised 11 October 2011
- Accepted 14 October 2011
- Published in print 1 December 2012.
- Published online 9 November 2012.
- Published first 23 November 2011.
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