- Correspondence to Dr Kyung Rim Sung, Department of Ophthalmology, University of Ulsan, College of Medicine, Asan Medical Center 388-1 Pungnap-2-dong, Songpa-gu, Seoul, Korea 138-736;
- Received November 11, 2016
- Revised February 16, 2017
- Accepted March 16, 2017
- First published April 10, 2017.
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