- Correspondence to Prof Sang Hyun Choi, Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-Ro 43-Gil, Songpa-Gu, Seoul 05505, Republic of Korea;
- Received February 20, 2019
- Revised June 30, 2019
- Accepted July 3, 2019
- First published July 12, 2019.
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