- Correspondence to Dr Jeong-Soo Im, College of Medicine, Gachon University, Seongnam, the Republic of Korea; ; Professor Jaehun Jung, Department of Preventive Medicine, Gachon University College of Medicine, Incheon, the Republic of Korea;
- Received December 19, 2019
- Revised March 20, 2020
- Accepted March 27, 2020
- First published April 27, 2020.
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