- Correspondence to Dr Seong-Woo Kim, Department of Ophthalmology, Korea University Ansan Hospital, 123, Jeokgeum-ro, Danwon-gu, Ansan-si, Gyeonggi-do 425-707, South Korea;
- Received 9 October 2016
- Revised 26 December 2016
- Accepted 30 January 2017
- Published online 26 September 2017.
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