- Correspondence to Professor Xue-Dong Zhang, Department of Ophthalmology, The First Affiliated Hospital of Chongqing Medical University, No.1 You Yi Road, Yu Zhong District, Chongqing 400016, China;
- Received May 22, 2013
- Revised September 5, 2013
- Accepted September 22, 2013
- First published October 16, 2013.
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