- Correspondence to Dr Peiquan Zhao, Department of Ophthalmology, Xinhua Hospital, affiliated to Shanghai Jiaotong University School of Medicine, No. 1665, Kongjiang Road, Shanghai 200092, China;
- Received April 17, 2013
- Revised June 9, 2013
- Accepted July 3, 2013
- First published July 22, 2013.
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