- Correspondence to Dr Peiquan Zhao, Department of Ophthalmology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Rd, Shanghai 200092, People's Republic of China;
- Received April 19, 2015
- Revised May 18, 2015
- Accepted May 27, 2015
- First published June 11, 2015.
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