- Correspondence to Dr YD Cho, Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, 28 Yongon-dong, Jongno-gu, Seoul 110–744, Korea;
- Received July 3, 2015
- Revised September 18, 2015
- Accepted September 28, 2015
- First published October 27, 2015.
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