- Correspondence to Dr Young Hee Yoon, Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, #388-1, Pungnap-Dong, Songpa-Gu, Seoul 138-736, Korea;
- Received November 19, 2012
- Revised March 11, 2013
- Accepted March 20, 2013
- First published April 20, 2013.
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