- Correspondence to Dr Don-Il Ham, Department of Ophthalmology, Samsung Medical Center,Sungkyunkwan University School of Medicine, Seoul, South Korea; and Professor Yun-Mi Song, Department of Family Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea;
- Received June 2, 2019
- Revised November 13, 2019
- Accepted December 10, 2019
- First published January 20, 2020.
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