- Correspondence to Dr Yanrong Jiang, Department of Ophthalmology, Peking University People's Hospital, 11 Xizhimen South Street, Xicheng District, Beijing 100044, China;
- Received November 4, 2014
- Revised March 1, 2015
- Accepted March 12, 2015
- First published April 3, 2015.
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