- Correspondence to Dr 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, Republic of Korea;
- Received November 12, 2020
- Revised February 14, 2021
- Accepted February 18, 2021
- First published March 1, 2021.
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