- Correspondence to Dr Yi Qu, Department of Ophthalmology, Qilu Hospital of Shandong University, No. 107, Wenhuaxi Road, Jinan 250012, China; ; and Dr. Wenbin Wei, Beijing Tongren Hospital, Capital Medical University, Beijing Tongren Eye Center, Beijing Ophthalmology & Visual Science Key Laboratory; No.1, Dongjiaominxiang, Beijing 100730, China;
- Accepted 12 April 2011
- Published in print 1 August 2011.
- Published online 20 July 2011.
- Published first 7 May 2011.
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