- Correspondence to Dr Yuan Bo Liang, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University; Beijing Ophthalmology & Visual Science Key Lab. No. 1 Dong Jiao Min Xiang Street, Dongcheng District, Beijing, People’s Republic of China, 100730;
- Received August 5, 2012
- Revised February 21, 2013
- Accepted March 6, 2013
- First published April 16, 2013.
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