- Correspondence to Dr Chang-Woo Ryu, Department of Radiology, Kyung Hee University Hospital at Gangdong, School of Medicine, Kyung Hee University, Seoul 05278, Republic of Korea;
- Received November 13, 2017
- Revised December 27, 2017
- Accepted January 2, 2018
- First published January 19, 2018.
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