- Correspondence to Dae Young Yoon, Department of Radiology, Kangdong Seong-Sim Hospital, Hallym University College of Medicine, 150, Seongan-ro Gangdong-Gu, Seoul 134-701, Korea;
- Received 18 March 2016
- Revised 11 April 2016
- Accepted 12 April 2016
- Published online 13 April 2017.
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