- Correspondence to Dr Kyung Rim Sung, Department of Ophthalmology, University of Ulsan, College of Medicine, Asan Medical Center, Songpa-gu, Seoul 138-736, South Korea;
- Received August 4, 2017
- Revised November 7, 2017
- Accepted January 20, 2018
- First published February 2, 2018.
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